I'll add a few words on the Seafoam cleaner. It contains no beneficial fuel detergents. However it is loaded with alcohol, which when burned gives the impression of better ignition. So it is basically a "one tank wonder". Better to spend your money on a valid polyether amine fuel cleaning product like BG 44K or Techron in my opinion. My motorcycle friends all rave on the Seafoam, but in actuality all it does is burn faster, thus fooling us into thinking it is a wonder drug cleaner. So I got curious and analyzed the Seafoam. It turned out to be just plain isopropyl alcohol, a dilution solvent, and a small percentage of light mineral oil. No significant metal additives or detergents to be found. So...my two cents worth of advice is spend your money elsewhere...
Mikey B.
Gas Chromatograph/Fuels Chemist
1985 Yamaha VMAX 1200
1993 Pontiac Bonneville 3.8L