Voltage divider worked good on a 5.0 HO mustang.(batteries lasted for weeks) 10% improvement
The rheostat is still on my 5.0 F250 don't have any improvement data because my pulse width mileage computer gets very confused when the pulse width goes to 80% and the injector still wouldn't open. But i have range enough range to stall the engine so i am sure lean burn is in between there somewhere. It is difficult to hurt these old cast iron engines at low throttle settings. never had any problems with detonation.
