RootesRacer
Donation Time
If you run just E85 you can lean out the car and get better gas mileage, why they have a new program for my Impala computer controlled fuel injection.
Donna
You cant lean the mixture out much becuase the combustion runs really hot, and you cook the motor. The saving grace for many newer cars is that they use a wideband O2 sensor, which allows the engine management to see the actual air fuel ratio, and to richen it up (since E83 will run really lean on a gasoline map) so that the engine doesnt fall completely on its butt. Such setups that CAN run on E85 or are flexfuel compliant, dont work as well (bad throttle and transient response) unless the engine management has been mapped for both E83 and gasoline, and has the fuel constitution sensor.