Part of the answer depends on what state you live in. The original Berryman B-12 Chemtool Carburetor, Choke & Throttle Body Cleaner aerosol (part #0110, #0117, and #0120) is 100% strong solvent and is actually the same formula as B-12 Chemtool Fuel System Cleaner gasoline fuel additive (part #0116). As such, the two products and generally be used interchangeably. In some parts of the country like California, the aerosol product (part #0110C, #117C, and #0120C) is a different formula and would not be quite as effective in the gas tank. In that case, buying 0116 would be your best option if it fits your application needs.