I ran into a guy at a dunkin donuts he told me i could put a feul pre heater on my truck that ties into the cooling system. he said it should increase my mpgs so i should get 35 to 45 mpgs. it will do this by pre heating the fuel before it gets to the injectors so the motor will not be working as hard the heat the fuel. i dont know if any of the is true. can't find anything with this kind of info on the net just stuff for the winter. if it will help alot when it is cold out this to would be a good help to know because it gets cold here in New Hampshire and i will be plowing with it. It will also be my first winter with a diesel truck. thank for the help.