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.
2012 BMW F10 520d M-Sport
2010 BMW E70 X5 xdrive40d