allycat, you're a man of few words. I'm sure sure some Ford V-10 owners will answer up but some more detail might get you a better answer. Is that V-10 in a pick up truck, a Class C or A motorhome? How many feet long and are you towing? Don't be surprised if the answers you get are all over the board. I record every fill up and do the math. Over years of travel, I'm getting 6.5 mpg with a workhorse chassis and the 8.1, mostly traveling with the generator running and towing. I've seen folks with similar rigs say they get 9 mpg. Some take the mpg off the dash computer or a just a couple of fill ups or their driving habits are far superior to mine. 6, 7, or 8 mpg in a Class A rig is believable with either the GM or Ford power train.
