[amk2912]

I thought I'd see if I could hypermile in the M3 so I drove a whole tank (400km) driving like a nanna, not allowing the car to rev higher than 3000rpm and changing into the highest gear as quick as possible.

The result? 15.2 l/100km!!!!!!!!

Next tank. Normal driving. M-drive used wherever possible and reaching the speed limit as quick as possible.

The result? 14.1l/100km!!!!!!!

Can't work that one out.