I did a 3100 mile trip a few weeks ago through the western mountain states crusing at 80mph most of the time and got and overall trip avg of 23.3 with tanks ranging from 23 to 24 mpg. Had my grandson with me so no great displays of speed, just a few quick passing sprints. Lots of FUN. That was in the un-modded SSB. The Aero would be very different I expect.

MikeR