Western NC to Raleigh then on to Savannah I averaged pretty much on the dot of 30mpg and usually found myself at 75mph. I did notice that 70-72 seemed to be the sweet spot for mpg and above 72 it would start to drop at a noticeable rate. Enough so that 75 is where I wanted to top out to make each part of the trip on one tank. Dropping to 24mpg at 78mph does seem a bit extreme while on fairly flat roads though. Daily driving up in the mountains I see about 22-24 average in and around mostly town driving. SX Turbo as well.