The Official "My Gas Mileage *****" Thread

[3-LIB3RTYS-3]

I’m getting that kind of mileage on the highway myself. I’ve read here that I should change my upstream O2 sensors.

Unfortunately (or not ), I’ve put a ton into this car so nearly everything is new.

Has anyone used a performance chip to improve fuel economy?

 

[tommudd]

Unfortunately (or not ), I’ve put a ton into this car so nearly everything is new.

Has anyone used a performance chip to improve fuel economy?

Tried , yes some years back some did
Did it work , NO big fat NO