FYI -- at 62mph I managed a nice 20.3mpg over a 50 - 60 miles stretch of road. Kicked it up to 65 for the last 100 miles (and more hills) and hit 18.2mpg over the 160 miles I drove today. NICE :D
Passed a nice older AF990 on an F350 Dually and it seemed to rock a lot more than my SRW did which lead my wife to comment....I told her we spent so much money making the old truck awesome it would be tough to compare it to a stock truck but she's not convinced this new dually is going to be better going down the road than the SRW....
It just has more wheels.