Week 1 of owning 330ci:
averaged 25.5 mpg driving fast everywhere, which is 3 mpg higher than my slower, conservatively-driven, negligibly heavier '98 sable ls. first resonator deleted + LED interior lighting overhaul and i am loving it alllll. probably going to order m3 LED tails this monday, and down the road maybe a HID retrofit, angel eyes, and an interior/exterior detail. not much you can do to these cars power-wise that's worth the price, so i'm sticking with cosmetic mods lol
i used to get looks all the time in the smashed sable - more or less quick "look at that junk, haha teenagers" glances - but people stare at my bmw. just this morning, someone in an SUV stopped in front of my lawn to take a quick picture of it and last night i got 2 compliments in a parking lot
it's not super fast but it's fast enough; great low-end torque. the real fun is in the nimbleness and connected feel. overall, i love driving, seeing and hearing it (straight 6 rasp is addicting)