I took the Aero out to Wyoming in July and cruising at 82 (most of the way is posted 75) most of the time I got 23mpg. I was pleasantly surprised as I was thinking it would be more like 20mphg....

The SSB got 24mpg on two like trips(3000 miles round trip each)....

26 - 27mpg would seem doable if driving a conservative 65....