That would take me a month of Sunday's to figure out. Lemme see: The average big rig, once going down the road, gets between 5.5 to 6.5 miles per gallon. That load can be up to 80,000 pounds, 48,000 lbs being the payload.
We have right smart folks here who could could break that down to reflect costs with a two cent a gallon increase.
I ain't one of them ;^)
I thought maybe there was a source somewhere compiled by squinty little guys with pocket protectors.