I have the 22 gallon tank. Around town I would get around 300 miles to the tank, filled it up when it was at a quarter usually. Got about 16mpg around town.

I noticed my Jeep gets less mileage here in PA than it was getting in AZ. I think its because in Phoenix, all the roads are straight and flat. Here in PA the roads have a lot more hills and curves. Haven't been driving the Dakota here. So I'm not sure how the terrain effected its gas mileage.