Just got back from a 800 mile trip with the 2015 2.7L TT (2000 miles on car). Ran it 70-75 mph on 87 octane regular with up to 10% ethanol. Got 26.8 mpg on way up and 27.8 on the way back. Trip odometer and manual calculation pretty much the same. Happy with car. Vista roof open all the way is a little overwhelming though.