This seems pretty hard to do but is there a way to figure out how efficient a vehicle is based on fuel used and MPG? I know theres about 1/3 gone to exhaust 1/3 through radiator and 1/3 is work but I want to get an exact percentage on the work part. So it would be 33% if it was like what I just stated. I know weights of the vehicles, everything. I want to factor in as much as possible so I can get the closest possible percent. Thanks for any help!