Yeah i wouldn't expect the M2 to pull such tall gears as the F10.
TBH i rarely use 6th or 5th for that matter. And if i use 6th I'll bypass 5th.
I run it up to 3rd/4th for all but motorway / DC, then straight into 6th for brain off cruising 70+, which thankfully isn't very often.
It'll do 30-140 in 4th so 50/60/70 i just stay in 4th, then 3rd for overtake.
I find 6th a bit depressing lol.
Probably why i have such poor mpg. But i didn't buy it to save the planet.