How is that possible?? I swear I'm getting 12 mpg with 33's! I've used 3/4 of a tank and I've gone around 220 miles.
I can drive like an ass (pedal to the metal for a full tank of gas) and still average 14 on the highway. Worst ever was 12's while towing a heavy trailer thru the mountains in North Carolina.....kept it out of overdrive the whole trip.