According to PickupTrucks.com, burning E85 in the new 5.0L V8 available in the 2011 F-150 results in increased power.
The 5.0 is rated at 360 horsepower (at 5,500 rpm) and 380 pounds-feet of torque (at 4,250 rpm) running on regular unleaded gasoline. It's positioned as the midrange, high-volume engine choice for the F-150, below the more powerful 3.5-liter EcoBoost V-6 (365 hp and 420 pounds-feet of torque) and conventional large-displacement 6.2-liter V-8 (411 hp and 434 pounds-feet of torque).
But the 5.0 is also flex-fuel capable. Flexible-fuel vehicles are designed to run on gasoline or a blend of up to 85 percent ethanol (E85).
Burning E85 fuel boosts 5.0 engine power to 375 hp and 390 pounds-feet of torque, said Mike Harrison, Ford's program manager for V-8 engines.