Generac GP6700E Dual Fuel
#6 in Mid-sizeFull review
A mid-size dual-fuel generator for home backup at a low price, for buyers who want propane as a fallback. The 50-state fuel-injected model costs more.
Amazon $899$899
The Generac GP6700E Dual Fuel and the Generac GP6700E Dual Fuel EFI are evenly matched, rated 4.3 and 4.2. The Generac GP6700E Dual Fuel leads on value. The Generac GP6700E Dual Fuel EFI wins on run time. The Generac GP6700E Dual Fuel costs $260 less ($899 vs $1,159).
Generac GP6700E Dual Fuel EFI
#7 in Mid-sizeFull review
A fuel-injected dual-fuel generator for backing up a home’s essentials through a 30 A transfer switch, and the GP6700E DF to buy in California. Elsewhere the carbureted GP6700E DF does the same job for less.
Amazon $1,159$1,159
Prices were last checked October 28, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Generac GP6700E Dual Fuel for value ($0.13 per running watt vs $0.17 per running watt).
- Choose the Generac GP6700E Dual Fuel EFI for run time (13 hours on a tank at 50% load vs 11 hours on a tank at 50% load).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every mid-size portable generator; a clear win is highlighted. How we rank explains each one.
| Factor weight | Generac GP6700E Dual Fuel | Generac GP6700E Dual Fuel EFI |
|---|---|---|
| Overall rating | 4.3/5 | 4.2/5 |
| Value 30% | 79 $0.13 per running watt | 60 $0.17 per running watt |
| Run time 15% | 70 11 hours on a tank at 50% load | 90 13 hours on a tank at 50% load |
| Fuel options 15% | 70 gasoline or propane | 70 gasoline or propane |
| Home hookup 15% | 100 240 V outlet for a transfer switch | 100 240 V outlet for a transfer switch |
| CO safety 10% | 100 shuts off when carbon monoxide builds up | 100 shuts off when carbon monoxide builds up |
| Warranty 10% | 50 warranty not published (neutral score used) | 67 3-year warranty |
| Starting 5% | 80 push-button electric start | 80 push-button electric start |
Specifications
| Generac GP6700E Dual Fuel | Generac GP6700E Dual Fuel EFI | |
|---|---|---|
| Output | ||
| Gasoline | 6,700 W running, 8,250 W starting | 6,700 W running, 8,250 W starting |
| Propane | 6,000 W running, 7,425 W starting | 6,000 W running, 7,425 W starting |
| Outlets | L14-30 | 4 × 120 V, L14-30 |
| Transfer switch ready | Yes, 240 V | Yes, 240 V |
| Full power at 120 V | No | No |
| Price per watt | $0.13 | $0.17 |
| Fuel and run time | ||
| Fuel | Gasoline, propane | Gasoline, propane |
| Tank | 7.5 gal | 7.5 gal |
| Run time (gasoline) | 11 hr at 50% load | 13 hr at 50% load |
| Run time (propane, 20 lb tank) | 6 hr | 6 hr |
| Engine | 340 cc | 340 cc |
| Noise and safety | ||
| CO shutoff | Yes | Yes |
| CARB compliant | No | Yes |
| Build | ||
| Starting | Electric and recoil | Electric and recoil |
| Wheels | Yes | Yes |
| Dimensions | - | 27.5 x 27 x 26.5 in |
| Weight | 174.2 lb | 181 lb |
| Warranty | - | 3 years |