The Champion 12,500-Watt Tri Fuel and the Generac GP9500E Tri Fuel EFI are evenly matched, rated 4.2 and 4.2. The Champion 12,500-Watt Tri Fuel leads on value. The Generac GP9500E Tri Fuel EFI wins on run time. The Champion 12,500-Watt Tri Fuel costs $139.01 less ($1,259.99 vs $1,399).
A large tri-fuel generator for whole-home backup on a natural gas line, where it can run for days. Less suited to gasoline-only use, where it burns through a tank quickly.
Amazon $1,259.99A large tri-fuel generator with fuel injection for whole-home backup, and the version to buy in California. Elsewhere the carbureted GP9500E does the same job for less.
Amazon $1,399Prices 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 large portable generator; a clear win is highlighted. How we rank explains each one.
| Factor weight | Champion 12,500-Watt Tri Fuel | Generac GP9500E Tri Fuel EFI |
|---|---|---|
| Overall rating | 4.2/5 | 4.2/5 |
| Value 30% | 73 $0.13 per running watt | 60 $0.15 per running watt |
| Run time 15% | 40 8 hours on a tank at 50% load | 65 10.5 hours on a tank at 50% load |
| Fuel options 15% | 100 gasoline, propane or natural gas | 100 gasoline, propane or natural gas |
| 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 |
| Champion 12,500-Watt Tri Fuel | Generac GP9500E Tri Fuel EFI | |
|---|---|---|
| Output | ||
| Gasoline | 10,000 W running, 12,500 W starting | 9,500 W running, 12,500 W starting |
| Propane | 9,000 W running, 11,250 W starting | 8,550 W running, 11,250 W starting |
| Natural gas | 8,000 W running, 10,000 W starting | 7,000 W running, 9,000 W starting |
| Outlets | 4 × 120 V, L14-30, 14-50 | 2 × 120 V, L14-30, 14-50 |
| Transfer switch ready | Yes, 240 V | Yes, 240 V |
| Full power at 120 V | - | No |
| Price per watt | $0.13 | $0.15 |
| Fuel and run time | ||
| Fuel | Gasoline, propane, natural gas | Gasoline, propane, natural gas |
| Tank | 7.7 gal | 7.5 gal |
| Run time (gasoline) | 8 hr at 50% load | 10.5 hr at 50% load |
| Run time (propane, 20 lb tank) | 3 hr | 5 hr |
| Engine | 500 cc | 500 cc |
| Noise and safety | ||
| Rated noise | 74 dBA | - |
| CO shutoff | Yes | Yes |
| CARB compliant | No | Yes |
| Build | ||
| Starting | Electric and recoil | Electric and recoil |
| Wheels | Yes | Yes |
| Dimensions | 29 x 28.5 x 25.8 in | 27.2 x 26.94 x 27 in |
| Weight | 231 lb | 227 lb |
| Warranty | 3 years | 3 years |
| Released | 2025-02 | 2025-03 |
