The truck has stock sized "31 tires, and the stock 4:10 gearing. I understand the engines efficiency at certain speeds, but I just dont understand how the mileage can be that low compared to other trucks city mileage with comparable mods. I would expect 15 city at the worst, but 12 is horrible especially considering the highway mileage is decent. It just seems like such an abnormally large difference between city and highway mileage. I have been driving very easy as well to maximize mileage, and I do coast as much as possible up to lights and such.
I know the guages arent entirely accurate on these trucks, but I recently filled up, and drove 200 miles round trip all highway, and the guage read barely under half tank at that point. as soon as I started driving in the city again it only took 25 miles to go from slightly under a half tank, all the way down to the first mark on the guage above the red empty mark (1/4 tank I think?). If I fill up, and drive only in the city I only get about 100 miles at the half tank mark every time!