e46 or e92 M3

[318 iS Cosmos]

I'd need to double check but I'm pretty sure I don't average much more than mid-20s on my 318Ci.

There seems like no good reason not to get an M3, lol

That's woeful! I was getting 26-28 mpg in my 325Ci and my dad has a 318Ci and he's consistently returning 33-35mpg and up to 40 on long runs