Skip to main content
ReaLoadREVIEWS
Power Architecture Hub

Gasoline EFI & Inverter Generators

Side-by-Side Compare Load Sizing Calculator

Gasoline inverter generators with electronic fuel injection deliver maximum fuel economy and zero carburetor maintenance. They produce clean power (<3% THD) to safeguard home computers, furnaces, and medical equipment.

1 Highest power-to-weight ratio and peak surge wattage per dollar
2 Electronic fuel injection (EFI) eliminates manual choking and hard winter starts
3 Requires fresh ethanol-free gasoline and routine fuel stabilizer management

Tested Models in this Class (30)

Sorted by continuous running power
Dual-Fuel Score 9.3/10
Enclosed Inverter 1.2% THD
Honda : Honda GX390 EFI Closed-Loop Fuel-Injected OHV : Floating Neutral

Honda EU7000iS 7,000W Peak / 5,500W Running Fuel-Injected Ultra-Quiet Inverter

Best For: Ultra-reliable fuel-injected (EFI) quiet backup with whisper-quiet 52 dBA acoustic insulation.

Running / Surge 5,500W / 7,000W
Noise @ 23ft 52 dBA (Quiet)
Fuel & Runtime Gas EFI (18h)
Backup Outlet NEMA L14-30R
Power Purity <1.2% THD (Floating)
Weight & Mobility 261 lbs (Wheel Kit)
Lowest Verified Price
$5,199.00
$0.95 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.5/10
Open-Frame Inverter 4.8% THD
A-iPower : 459cc A-iPower 4-Stroke OHV Engine : Bonded Neutral

A-iPower SUA12000ED 12,000W Peak / 9,000W Running Dual-Fuel Generator with Electric Start

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 9,000W / 12,000W
Noise @ 23ft 73 dBA (Open-Frame)
Fuel & Runtime Gas EFI (13.5h)
Backup Outlet NEMA 14-50R
Power Purity <4.8% THD (Bonded)
Weight & Mobility 216 lbs (Wheel Kit)
Lowest Verified Price
$999.00
$0.11 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.5/10
Open-Frame Inverter 2.6% THD
Champion : 420cc Champion 4-Stroke OHV Engine : Floating Neutral

Champion 100520 8,750W Peak / 7,000W Running Open-Frame Inverter with Quiet Technology

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 7,000W / 8,750W
Noise @ 23ft 69.5 dBA (Open-Frame)
Fuel & Runtime Gas EFI (13.5h)
Backup Outlet NEMA 14-50R
Power Purity <2.6% THD (Floating)
Weight & Mobility 149 lbs (Wheel Kit)
Lowest Verified Price
$949.00
$0.14 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.6/10
Open-Frame Inverter 2.5% THD
Champion : 420cc Champion 4-Stroke OHV Engine : Floating Neutral

Champion 201067 9,000W Peak / 7,250W Running Open-Frame Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 7,250W / 9,000W
Noise @ 23ft 70 dBA (Open-Frame)
Fuel & Runtime Gas EFI (13h)
Backup Outlet NEMA 14-50R
Power Purity <2.5% THD (Floating)
Weight & Mobility 152 lbs (Wheel Kit)
Lowest Verified Price
$999.00
$0.14 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.8/10
Enclosed Inverter 1.7% THD
Cummins : 98cc 4-Stroke OHV Engine : Floating Neutral

Cummins Onan P2500i 2,500W Peak / 2,200W Running Digital Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 2,200W / 2,500W
Noise @ 23ft 52 dBA (Quiet)
Fuel & Runtime Gas EFI (10h)
Backup Outlet NEMA 5-20R GFCI
Power Purity <1.7% THD (Floating)
Weight & Mobility 48 lbs (Wheel Kit)
Lowest Verified Price
$699.00
$0.32 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.7/10
Enclosed Inverter 1.6% THD
Cummins : 224cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

Cummins Onan P4500i 4,500W Peak / 3,700W Running Ultra-Quiet Enclosed RV Inverter

Best For: Whisper-quiet 52 dBA RV camping and emergency 120V refrigerator and furnace power.

Running / Surge 3,700W / 4,500W
Noise @ 23ft 52 dBA (Quiet)
Fuel & Runtime Gas EFI (18h)
Backup Outlet NEMA L14-30R
Power Purity <1.6% THD (Floating)
Weight & Mobility 98 lbs (Wheel Kit)
Lowest Verified Price
$1,099.00
$0.30 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.6/10
Open-Frame Inverter 4.9% THD
DuroMax : 457cc DuroMax 4-Stroke OHV Engine : Bonded Neutral

DuroMax XP12000EH 12,000W Peak / 9,500W Running Dual-Fuel Home Backup Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 9,500W / 12,000W
Noise @ 23ft 72 dBA (Open-Frame)
Fuel & Runtime Gas EFI (16h)
Backup Outlet NEMA 14-50R
Power Purity <4.9% THD (Bonded)
Weight & Mobility 224 lbs (Wheel Kit)
Lowest Verified Price
$1,099.00
$0.12 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.8/10
Open-Frame Inverter 4.6% THD
DuroMax : 713cc V-Twin DuroMax 4-Stroke OHV Engine : Bonded Neutral

DuroMax XP15000EH 15,000W Peak / 12,000W Running V-Twin Dual-Fuel Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 12,000W / 15,000W
Noise @ 23ft 74 dBA (Open-Frame)
Fuel & Runtime Gas EFI (14.5h)
Backup Outlet NEMA 14-50R
Power Purity <4.6% THD (Bonded)
Weight & Mobility 330 lbs (Wheel Kit)
Lowest Verified Price
$2,499.00
$0.21 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.5/10
Open-Frame Inverter 4.9% THD
Firman : 439cc Firman Max Pro OHV Engine : Bonded Neutral

Firman H07552 9,400W Peak / 7,500W Running Dual-Fuel Generator with Electric Start

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 7,500W / 9,400W
Noise @ 23ft 72.5 dBA (Open-Frame)
Fuel & Runtime Gas EFI (15h)
Backup Outlet NEMA 14-50R
Power Purity <4.9% THD (Bonded)
Weight & Mobility 212 lbs (Wheel Kit)
Lowest Verified Price
$999.00
$0.13 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.6/10
Enclosed Inverter 1.9% THD
Firman : 171cc Firman Max Pro OHV Engine : Floating Neutral

Firman WH03042 3,300W Peak / 3,000W Running Dual-Fuel Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 3,000W / 3,300W
Noise @ 23ft 58 dBA (Quiet)
Fuel & Runtime Gas EFI (10.5h)
Backup Outlet NEMA TT-30R
Power Purity <1.9% THD (Floating)
Weight & Mobility 90 lbs (Wheel Kit)
Lowest Verified Price
$799.00
$0.27 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.5/10
Open-Frame Inverter 4.8% THD
Generac : 389cc Generac OHV Engine : Bonded Neutral

Generac GP6500 8,125W Peak / 6,500W Running Gas Generator with COsense

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 6,500W / 8,125W
Noise @ 23ft 71 dBA (Open-Frame)
Fuel & Runtime Gas EFI (16h)
Backup Outlet NEMA L14-30R
Power Purity <4.8% THD (Bonded)
Weight & Mobility 177 lbs (Wheel Kit)
Lowest Verified Price
$899.00
$0.14 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.6/10
Open-Frame Inverter 4.7% THD
Generac : 420cc Generac OHV Commercial Engine : Bonded Neutral

Generac GP8000E 10,000W Peak / 8,000W Running Electric Start Generator with COsense

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 8,000W / 10,000W
Noise @ 23ft 72 dBA (Open-Frame)
Fuel & Runtime Gas EFI (14.5h)
Backup Outlet NEMA L14-30R
Power Purity <4.7% THD (Bonded)
Weight & Mobility 200 lbs (Wheel Kit)
Lowest Verified Price
$1,099.00
$0.14 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.2/10
Open-Frame Inverter 2.9% THD
Generac : 459cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Generac GP9200E 11,500W Peak / 9,200W Running PowerRush Home Backup Generator

Best For: Traditional gasoline 50-amp home backup with nationwide Generac dealer support.

Running / Surge 9,200W / 11,500W
Noise @ 23ft 72.5 dBA (Open-Frame)
Fuel & Runtime Gas EFI (15h)
Backup Outlet NEMA 14-50R
Power Purity <2.9% THD (Bonded)
Weight & Mobility 211 lbs (Wheel Kit)
Lowest Verified Price
$1,199.00
$0.13 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.5/10
Enclosed Inverter 1.9% THD
Generac : 212cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

Generac iQ3500 3,500W Peak / 3,000W Running Ultra-Quiet Enclosed Inverter

Best For: Ultra-quiet 53 dBA suburban patio placement for essential 120V home circuits.

Running / Surge 3,000W / 3,500W
Noise @ 23ft 53 dBA (Quiet)
Fuel & Runtime Gas EFI (14.1h)
Backup Outlet NEMA L14-30R
Power Purity <1.9% THD (Floating)
Weight & Mobility 109.1 lbs (Wheel Kit)
Lowest Verified Price
$1,249.00
$0.42 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.6/10
Open-Frame Inverter 2.6% THD
Generac : 459cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Generac XT8500EFI 10,000W Peak / 8,500W Running Closed-Loop EFI Home Backup Generator

Best For: Homeowners wanting zero-carburetor-maintenance EFI reliability at half the price of a Honda.

Running / Surge 8,500W / 10,000W
Noise @ 23ft 70.5 dBA (Open-Frame)
Fuel & Runtime Gas EFI (16h)
Backup Outlet NEMA 14-50R
Power Purity <2.6% THD (Bonded)
Weight & Mobility 202 lbs (Wheel Kit)
Lowest Verified Price
$1,449.00
$0.17 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.5/10
Enclosed Inverter 2.2% THD
Genmax : 312cc 4-Stroke OHV Air-Cooled Engine : Floating Neutral

Genmax GM6000iED 6,000W Peak / 5,000W Running Dual-Fuel Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 5,000W / 6,000W
Noise @ 23ft 62 dBA (Quiet)
Fuel & Runtime Gas EFI (11.5h)
Backup Outlet NEMA L14-30R
Power Purity <2.2% THD (Floating)
Weight & Mobility 118 lbs (Wheel Kit)
Lowest Verified Price
$999.00
$0.20 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.6/10
Open-Frame Inverter 2.8% THD
Honda : 389cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

Honda EM6500S 6,500W Peak / 5,500W Running iAVR Commercial Home Backup Generator

Best For: Commercial-grade 30-amp home transfer switch and heavy jobsite motor starting.

Running / Surge 5,500W / 6,500W
Noise @ 23ft 64 dBA (Quiet)
Fuel & Runtime Gas EFI (11.2h)
Backup Outlet NEMA L14-30R
Power Purity <2.8% THD (Floating)
Weight & Mobility 230 lbs (Wheel Kit)
Lowest Verified Price
$3,299.00
$0.60 / Running Watt
Compare
Read Review
Dual-Fuel Score 9.2/10
Enclosed Inverter 1.4% THD
Honda : 121cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

Honda EU2200i 2,200W Peak / 1,800W Running Whisper-Quiet Companion Inverter

Best For: Whisper-quiet 48 dBA camping and essential 120V refrigerator and furnace backup.

Running / Surge 1,800W / 2,200W
Noise @ 23ft 48 dBA (Quiet)
Fuel & Runtime Gas EFI (8.1h)
Backup Outlet NEMA L14-30R
Power Purity <1.4% THD (Floating)
Weight & Mobility 47.4 lbs (Wheel Kit)
Lowest Verified Price
$1,199.00
$0.67 / Running Watt
Compare
Read Review
Dual-Fuel Score 9.1/10
Enclosed Inverter 1.3% THD
Honda : 130cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

Honda EU3200i 3,200W Peak / 2,600W Running Fuel-Injected Ultra-Portable Inverter

Best For: Ultralight 59-lb fuel-injected camping, tailgating, and emergency refrigerator backup.

Running / Surge 2,600W / 3,200W
Noise @ 23ft 54 dBA (Quiet)
Fuel & Runtime Gas EFI (8.6h)
Backup Outlet NEMA L14-30R
Power Purity <1.3% THD (Floating)
Weight & Mobility 59.1 lbs (Wheel Kit)
Lowest Verified Price
$2,699.00
$1.04 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.5/10
Enclosed Inverter 1.7% THD
Kohler : 224cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

Kohler gen5.0 5,000W Peak / 4,200W Running Enclosed Pure Sine Inverter

Best For: Clean 1.7% THD backup for sensitive home office electronics and 30-amp RVs.

Running / Surge 4,200W / 5,000W
Noise @ 23ft 56 dBA (Quiet)
Fuel & Runtime Gas EFI (14h)
Backup Outlet NEMA L14-30R
Power Purity <1.7% THD (Floating)
Weight & Mobility 106 lbs (Wheel Kit)
Lowest Verified Price
$1,299.00
$0.31 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.8/10
Open-Frame Inverter 4.4% THD
Kohler : 429cc Kohler Command PRO 14 HP Engine : Bonded Neutral

Kohler PRO7.5 7,500W Peak / 6,300W Running Industrial Gas Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 6,300W / 7,500W
Noise @ 23ft 71 dBA (Open-Frame)
Fuel & Runtime Gas EFI (16h)
Backup Outlet NEMA 14-50R
Power Purity <4.4% THD (Bonded)
Weight & Mobility 198 lbs (Wheel Kit)
Lowest Verified Price
$1,499.00
$0.24 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.6/10
Open-Frame Inverter 2.8% THD
Kohler : 429cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Kohler PRO9.0E 9,000W Peak / 7,200W Running Command PRO Commercial Backup Generator

Best For: Heavy-duty commercial and rural home backup demanding a 2,000-hour Kohler Command PRO engine.

Running / Surge 7,200W / 9,000W
Noise @ 23ft 69.5 dBA (Open-Frame)
Fuel & Runtime Gas EFI (15.5h)
Backup Outlet NEMA 14-50R
Power Purity <2.8% THD (Bonded)
Weight & Mobility 218 lbs (Wheel Kit)
Lowest Verified Price
$1,699.00
$0.24 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.7/10
Enclosed Inverter 1.8% THD
Predator : 212cc Predator OHV Inverter Engine : Floating Neutral

Predator 3,500W Peak / 3,000W Running Super Quiet Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 3,000W / 3,500W
Noise @ 23ft 57 dBA (Quiet)
Fuel & Runtime Gas EFI (14h)
Backup Outlet NEMA TT-30R
Power Purity <1.8% THD (Floating)
Weight & Mobility 102 lbs (Wheel Kit)
Lowest Verified Price
$799.00
$0.27 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.6/10
Open-Frame Inverter 2.4% THD
Predator : 420cc Predator OHV Commercial Engine : Floating Neutral

Predator 8,750W Peak / 7,000W Running Inverter Generator with CO SECURE

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 7,000W / 8,750W
Noise @ 23ft 69 dBA (Open-Frame)
Fuel & Runtime Gas EFI (13h)
Backup Outlet NEMA 14-50R
Power Purity <2.4% THD (Floating)
Weight & Mobility 155 lbs (Wheel Kit)
Lowest Verified Price
$999.00
$0.14 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.5/10
Enclosed Inverter 2% THD
Predator : 459cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Predator 9500 9,500W Peak / 7,600W Running Super Quiet Enclosed Inverter

Best For: Homeowners and RV owners wanting quiet 240V inverter power with local Harbor Freight store support.

Running / Surge 7,600W / 9,500W
Noise @ 23ft 61.5 dBA (Quiet)
Fuel & Runtime Gas EFI (18.5h)
Backup Outlet NEMA 14-50R
Power Purity <2% THD (Bonded)
Weight & Mobility 257 lbs (Wheel Kit)
Lowest Verified Price
$2,299.00
$0.30 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.6/10
Enclosed Inverter 1.9% THD
WEN : 224cc 4-Stroke OHV Inverter Engine : Floating Neutral

WEN DF475iX 4,750W Peak / 3,800W Running Dual-Fuel Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 3,800W / 4,750W
Noise @ 23ft 58 dBA (Quiet)
Fuel & Runtime Gas EFI (11h)
Backup Outlet NEMA TT-30R
Power Purity <1.9% THD (Floating)
Weight & Mobility 105 lbs (Wheel Kit)
Lowest Verified Price
$699.00
$0.18 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.5/10
Open-Frame Inverter 2.5% THD
WEN : 420cc 4-Stroke OHV Engine : Floating Neutral

WEN GN875i 8,750W Peak / 7,000W Running Open-Frame Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 7,000W / 8,750W
Noise @ 23ft 69 dBA (Open-Frame)
Fuel & Runtime Gas EFI (13h)
Backup Outlet NEMA 14-50R
Power Purity <2.5% THD (Floating)
Weight & Mobility 145 lbs (Wheel Kit)
Lowest Verified Price
$849.00
$0.12 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.8/10
Enclosed Inverter 1.9% THD
Westinghouse : 224cc 4-Stroke OHV Inverter Engine : Floating Neutral

Westinghouse iGen4500DF 4,500W Peak / 3,700W Running Dual-Fuel Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 3,700W / 4,500W
Noise @ 23ft 58 dBA (Quiet)
Fuel & Runtime Gas EFI (18h)
Backup Outlet NEMA TT-30R
Power Purity <1.9% THD (Floating)
Weight & Mobility 98 lbs (Wheel Kit)
Lowest Verified Price
$899.00
$0.24 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.8/10
Open-Frame Inverter 4.5% THD
Westinghouse : 999cc V-Twin OHV Commercial Engine : Bonded Neutral

Westinghouse WGen20000c 28,000W Peak / 20,000W Running Heavy-Duty Commercial Backup Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 20,000W / 28,000W
Noise @ 23ft 74 dBA (Open-Frame)
Fuel & Runtime Gas EFI (15h)
Backup Outlet NEMA 14-50R
Power Purity <4.5% THD (Bonded)
Weight & Mobility 505 lbs (Wheel Kit)
Lowest Verified Price
$3,999.00
$0.20 / Running Watt
Compare
Read Review
Dual-Fuel Score 8.7/10
Open-Frame Inverter 4.8% THD
Westinghouse : 457cc Westinghouse 4-Stroke OHV Engine : Bonded Neutral

Westinghouse WGen9500DFc 12,500W Peak / 9,500W Running Dual-Fuel Generator with CO Sensor

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 9,500W / 12,500W
Noise @ 23ft 72 dBA (Open-Frame)
Fuel & Runtime Gas EFI (14h)
Backup Outlet NEMA 14-50R
Power Purity <4.8% THD (Bonded)
Weight & Mobility 211 lbs (Wheel Kit)
Lowest Verified Price
$1,149.00
$0.12 / Running Watt
Compare
Read Review

Explore Other Generator Categories

Tri-Fuel Inverter Generators (18) Dual-Fuel Inverter Generators (41) Gasoline EFI & Inverter Generators (30) Solar Battery Stations (LiFePO4) (16) Home Standby Generators & Automatic Transfer (56) Whole-Home Standby Generators & Automatic Transfer (56)