real world MPG wise, I'm getting a combined number of about 17 and the photo I took above is real for highway at 70 on a perfectly flat road. I was driving south out of columbus ohio on Rt 71 which is dead flat. I reset the computer and it stayed at 23 for about 20 miles and then I bumped the cruise up to 75 and it dropped to about 22.5 It stayed above 22 the rest of the way to Cincinnati.
I don't know how you're getting that. I just drove mine from Houston to home in SoCal and Averaged about 13.5. lol. I will fully admit I went about 600 miles into a 40 mph head wind on I40 when I hit the TX panhandle all the way through NM though. That was absolutely terrible.