[Al Jones]

The stabilizer(Stabil brand) will save you a bunch of headaches.I use it in everything (bikes,generators,chain saws,lawn tractor) that will sit for more than a month.For extended 'naps' I put just a tiny quantity of Marvel Mystery Oil in too and ad fresh gas to mix it up.Best method is to fill the tank to avoid condensation. Then,run the engine for a while so the mixture gets through the system. I have seen this combination even clear out carbs that had been sitting or dried out /varnished up without being treated.I used to drain everything but the 'top off' method keeps it from drying out and gaskets from shrinking and cracking.Downside is you run the risk of a leak(stuck float needle,etc.) but if you have shut offs,this will not happen. The octane boost does work but is it to cure a problem under hard load/hot or 'normal' driving? If detonation occurs,think about a colder plug or mixture settings.I don't know what the effective compression ratio is so your octane requirements could justify the booster( which should not effect o rings).The fuel stabilizer should not aggravate the pinging condition.You can use a small amount of booster to offset the effects of oil type additives until the tank is refilled.I would try retarding the timing ever so slightly and see what effect it has.Watch your temp gauge. A.J.