Originally Posted by
James @ M Developments.
That's pretty good really considering the size of the old girl
My 135I is only doing 12mpg during my trip to work and back
Awesome car, loving my N54 135i at the minute. It's on a JB4, intercooler and downpipes so should be around 420+bhp. It made 413bhp already without the downpipes
Getting 30mpg on my commute too!