i bought a bottle of seafoam, didnt read the directions and dumped the whole bottle in the tank! well ill tell ya what it mausta really needed it. cause now the little truck feels like it has 25 more hamsters. upon reading the directions, i realized it only calls for a half bottle and the rest going onto the crankcase. Accelerates and climbs hills way better!! i checked MPG and it is sitting about 26 maybe 29 on highway, i put in 10 gals and went 327miles, but there was like 1.5-2.5gals left in tank upon fill-up. Give it a try boys, and write down the MPG.