I have a 94 ram 1500 4x4 with the 318, no mods. I get 10 mpg no matter what i am towing or not towing. I can get better I just need to fix it, because my injectors are staying open to much. This is also causeing bad performace becasue it cant get out of its own way. with 230000 miles on it, i still love the old girl, and it has taken a lot of crap from me. I do wheel it, and then hook up to a trailer and do 70.. so its all good.
I do wish i had a CTD and a gooseneck trailer, but thats down the road.