The Generac GP6700E Dual Fuel EFI is the better portable generator overall, rated 4.2 to 3.9. The Generac GP6700E Dual Fuel EFI leads on fuel options and run time. The Generac GP8000E wins on value. The Generac GP8000E costs $110 less ($1,049 vs $1,159).
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 $1,159A gasoline generator for backing up most of a home’s essentials through a 30 A transfer switch at a low price. Buyers who want propane should look at a dual-fuel model.
Amazon $1,049Prices 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.
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 EFI | Generac GP8000E |
|---|---|---|
| Overall rating | 4.2/5 | 3.9/5 |
| Value 30% | 60 $0.17 per running watt | 80 $0.13 per running watt |
| Run time 15% | 90 13 hours on a tank at 50% load | 60 10 hours on a tank at 50% load |
| Fuel options 15% | 70 gasoline or propane | 0 gasoline only |
| 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% | 67 3-year warranty | 67 3-year warranty |
| Starting 5% | 80 push-button electric start | 80 push-button electric start |
| Generac GP6700E Dual Fuel EFI | Generac GP8000E | |
|---|---|---|
| Output | ||
| Gasoline | 6,700 W running, 8,250 W starting | 8,000 W running, 10,000 W starting |
| Propane | 6,000 W running, 7,425 W starting | - |
| Outlets | 4 × 120 V, 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 | $0.17 | $0.13 |
| Fuel and run time | ||
| Fuel | Gasoline, propane | Gasoline |
| Tank | 7.5 gal | 7.9 gal |
| Run time (gasoline) | 13 hr at 50% load | 10 hr at 50% load |
| Run time (propane, 20 lb tank) | 6 hr | - |
| Engine | 340 cc | 420 cc |
| Noise and safety | ||
| CO shutoff | Yes | Yes |
| CARB compliant | Yes | No |
| Build | ||
| Starting | Electric and recoil | Electric and recoil |
| Wheels | Yes | Yes |
| Dimensions | 27.5 x 27 x 26.5 in | 27.2 x 27 x 26.5 in |
| Weight | 181 lb | 198 lb |
| Warranty | 3 years | 3 years |
| Released | - | 2023-12 |
