Forget diesel, hybrid etc.. CSL returns 39mpg

[glendog74]

Originally Posted by mattCSLnut

It's only a matter of time before G-dog swings by with the GTOTD award for this

p.s. 35 MPG has been my best over 40 ish miles before I got bored driving like a saint to achieve this sort of numbers ... dropped a few cogs, SPORT button On and straight down to mid/low 20's MPGs where it belongs

Hmmm...

BOOM!