So if you were to throw this 15 gallon tank in the bed of your truck and pump it up to 175 psi of methane (NG), how close would that get you to two gallons gasoline equivalent?
DAYTON ELECTRIC MANUFACTURING CO./SPEEDAIRE Air Tank,Stationary,175 PSI,15 Gal,Horiz - Stationary Air Tanks - 1TZZ2|1TZZ2 - Grainger Industrial Supply
50 lbs, 3 feet wide, $450. 15 gal ~ 2 cu feet. One GGE of natural gas is 126.67 cubic feet equivalent, I think it is pretty close, not sure..