First off the truck is stock. Last week I took a 300 mile one way trip to the camp. I had 3/4 tank when I left then filled up a little over 1/4 tank. From there I traveled all Interstate/Highway w/o any stop and go traffic. Stayed at speeds of 45-75. When I got to the camp my read out was at 19.1 mpg. I put another 60 miles on back roads before filling up again. That brought the read out down to 18.1. After I filled up I hand calculated 17.5 mpg. I was very easy on the truck the entire time. If I drove like I normally do I would have probably been around 16-16.5. I'll post a pic as soon as I upload it to photobucket. I didn't reset the mpg avg either. It started off at 14.2 and climbed to 19.1.