I assume you have to be joking. If not, I don't know what to tell ya. Just in case you never put a pencil to it I'll give you an extremely simple example. Truck 1 is a V10 gasser and truck 2 is a diesel. Fuel prices in my area were $3.80 for gas and about $4.95 for diesel. My V10 gasser averages about 12 mpg and my diesel averages about 14 mpg. To run 1000 miles the diesel would burn 71.42 gallons of fuel at $4.95 a gallon; costing me $353.53 per 1000 miles in fuel alone. The gasser would burn 83.33 gallons of fuel at $3.80 a gallon; costing $316.65 per 1000 miles in fuel alone. Figure in the higher expense for the diesel vehicle, higher maintenance costs etc., and you'd be waaaay ahead running a gasser. I'm a huge diesel guy and own about a dozen diesel powered machines but the plain and simple math is indisputable in favor of running gassers unless you need diesel power to tow your load. Diesel would have to be back to being considerably less per gallon than gasoline for it to come out in favor of the diesel. The only other way to justify diesel in that situation is if you just plain want a diesel. Again, I have to assume that you were joking.