They generally tend to use lower compression motors that don't rev up much or like to for that matter while Japanese and Europeans are the opposite.quote:
Originally posted by brianl703:
That would be interesting. My observation is that both Ford and GM do not often specify premium for engines.
Edit: According to fueleconomy.gov, 2.4L Ecotec is specified for premium in the Cobalt but not in the G6. I have no idea what the difference is.