well the twin turbo 6 wasn’t designed for fuel economy!
check out a video… it’s a neat car… 140+ on straights and 115 through turns… bone stock 
[ame=“http://www.youtube.com/watch?v=Xrk13kldmTE”]YouTube - Roadfly.com - BMW 135i 1 Series Coupe on Track[/ame]
there aren’t 6 piston calipers up front for no reason 