Just came to post that. I couldn't believe it. My first fill up was 16.5mpg, and I thought it was a fluke it was so high. Then the next tank yielded the impressive 18.4! My last truck, a 2002 Dodge ram 1500 would get 10.5, so I'm thrilled! I drive mostly country type roads with lots of slowing down for curves or stop signs then up to 60, then back down. From what I can tell, the truck (Red Fred The Rusty Ol Flatbed) has 3.73 gears, 4sp transmission, and a na 6.9. I still need to change out my diff and tranny fluids too, which I can imagine will only help! Long story short - goodness I love this truck! It inexplicably brings all kinds of joy and delight when I chug down the road. Keep on trucking!