Originally Posted by CrashBandit
Well then, two different answers.. I think I'm using more gas being in 5th gear with the gas pedal pressed more than being in 4th using less gas.
I think its better on the engine to have the rpm's higher that to have higher boost.
Going up a steep hill in 5th with the gas pushed further seems to me like its causing more stress on the engine from "struggling".
Whereas going up a steep hill in 4th with the rpm higher makes the load on the engine a lot easier.