Double? No way it’s doubling mpg unless you’re comparing race track MPG to eco highway MPG. My 335i averages 24 in mixed driving in comfort. No way eco could get me 48mpg.

Fair enough there. He also should realize most f80s are underrated. I’ve seen plenty dyno in the 460-480whp range stock.

Idk where you get 510 hp. BM3 claims 400-420 with a stage 2 tune and catless DP.

I also want to know