PeteHall
Moderator
Cantclimbtom said:Got to be honest, that subtle performance edge that premium fuels supposedly gives is lost on me.
I once did a bit of a (not very scientific) test to see whether it was worth the extra cost of premium petrol in terms of improved MPG. I had driven my wife's Renault Clio from Bristol to Durham on regular petrol and recorded my MPG for the journey. Before I returned, I filled up with premium petrol and made the same long steady journey the other way and recorded my MPG.
My theory was that over two long and more or less identical journeys, I could work out a comparable ? per mile for both regular and premium petrol.
As it was, I never bothered working out the cost per mile, as the MPG on the return journey was identical; the premium fuel made no difference at all to my fuel economy.