No offense, but is this what you call 'highway" mileage? I could get my old 1999 dodge with 318 gas guzzler up to that if I went that slow too. Guess everyone's definition of highway is different.
Bring it on the interstate at 70 and let us know how it is then. Like I said, if it still gets 24-25mpg put it in the Smithsonian.
Clyde
Post a printout of your average speed.
Door to door.