[steelwind101]

It seems like in the USA you have fuels with much lower octane ratings then we do in UK. You can easily find fuel with an octane rating of 99 on supermarket forecourts.

With in certain parameters you will find engines adjust for inconsistancy etc. I have also noted however, in the USA many EU cars and even Japanese engines have less out put then they do on the same UK or European model.

I think many companies take the fuel issue in to account and seem to tune engines/ecu's accordingly.

There are a few which i have seen where its the same power and they do stress, "premium fuel only" during my visits to the USA.

Geoff