Jeffro you know I been using it since I got RDWII. 1oz per gallon and I'd buy the gallon jugs at NAPA for about $45. BUT that gets pretty expensive, adds up to about .35c an oz when you do the math. So I recently switched too the new Marine Formula Stabil. (It's black/dark blue and made for Ethanol as well, double the corrosion inhibitors and 4 times the fuel cleaners than the regular red variety.) Only gotta use 1oz per 5 gallons and I've also been running it in my Chevelle since Ethanol is everywhere. I buy the 32oz bottle and mix 1 oz per 5 gallons.
And if I remember right the 1oz too 5gal is actually the "storage mixture" rate. For regular use they say you can drop down too 1oz per 10gal. Either way it's considerably cheaper than Seafoam. Don't quote me but I think I paid $20 the last time I bought a 32oz bottle of the Sta-bil Marine. At 1oz-5gal that's .12c a gallon in treatment. At 1oz-10gal it's .06c a gallon. That's alot cheaper than the 1oz-1gal SeaFoam called for (.35c per).
Plus I think you're running the Merc Prem Plus oil like I am? That's a semi-syn so it's a lil cleaner than the older oils. If you run the full syn like a Pennz then it's that much cleaner as well. 87 octane is the culprit in my opinion. Gotta be careful where you get it.
http://www.sta-bil.com/sta-bil/stabil_marine.htm
Team Sta-bil gonna KICK THEM BUTTS at Fork in a few short weeks, :gone fishing
:twisted evil
RA