I haven't bought an m3 yet but I am set on one. My commute is about 100kms per day on all highway. It has to be a manual too. I like performance but value economy too, kinda like a 50/50 mix. Is the 2.5 a lot worse on fuel than the 2.0? In Canada there's 3 trims, the GS, GS, and GT. The GX is a definite no, I hate base models. The GS only comes with tha 2.0 and the GT, only the 2.5. All have manual options. So which is the better engine?