I am on my first tank of fuel still. Lots of run time in the shop and not too much driving. Looks like less than 10 mpg right now. I'm sure it will improve with the second and third tank. I have almost everything dialed in now, I think. Just need to drive some more. It's been a little difficult to drive since it's rained every day for the last week and half. My truck won't see rain for awhile.