Not wanting to upset you, but engines use science, not pure faith, the fact is 1100 rpm is way too low to have such a tall gear pull efficiently, thats a law of science. like i said at 40 mph 5th gear would indeed give better rpm. I am sure if you were to do a top up, rather than trust the trip computer you would see the piont i am making, and it is not anattack on you, but is based on facts,and not faith. regard Gio