Originally Posted by footie
...but this is only something I would want for the US market as over here with the fuel prices we need an engine which is more economical.
Another fair point. But then a V6 turbo will not exactly be a gas sipper (the 335i surely isn't - the mileage is about the same as my E46 M3). Also, the mileage only need be as good as the E9X M3 to have marketplace relevance, or better than the E9X M3 in order to have a marketplace advantage. Plus, as always, there will be no absence of lower fuel efficient A4 models for those who want them. As with nearly any car, you are going to have to trade efficiency for more power.