I bought a 2010 access cab lowboy in December. I drive a lot for work, and have already put a little over 10,000 miles on it.
I had a Scangauge II on my FJ Cruiser, and liked it. So I tried an Ultragauge on this Taco, and it's never within 1 1/2 gallons on the amount of fuel used, and I tried calibrating it every time. I finally pulled it off and forgot about it. I liked the Scangauge MUCH better.
Anyway, I've been keeping records and mileage has ranged from a low of 22.4 (70-75mph into a strong headwind) to 27.1 (70-75 with a strong tailwind). Both of those are rare, I am almost always getting 24.5-25.0. Up in Arkansas I can get pure gasoline and it does a little better on that. Last week I put 483 miles on one tank of gas, I think that is my high.