That's why I threw in the thing about "unless you completely change engines". That's what I did with my Swift - the engine was so bad that I completely replaced it. Now a small diesel, or even the smaller 3-cylinder engine, if I had found one, would have probably helped MPG even more, but I was in kind of a time crunch and a budget crunch, and I knew this identical replacement engine with super-low miles on it would be an easy and painless swap. And of course, I knew that a properly operating Swift, even with the "big" 4-cylinder engine, would give me great gas mileage - - maybe not world record type mileage, but something I'd be content with.
