Jon, I guess it comes down to doing the math. In my case I travel 750 miles each way. Lets say I carry 1500 pounds of ballast, and get 7 miles to the gallon with a gross weight of nine tons. Now if I drop 1500 hundred pounds, slow down to 65, buy a fuel economizer from J.C. Whitney, throw in a coupe of cow magnets, I should get, lets see, divide the weight by the square root of...ah, ah, ah crap, I'll just use the credit card and eat more macaroni and cheese ( not bad with a can of tuna thrown in).