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OK, I don't have a tractor or mower (lawn service - my one real luxury). Don't have a fire pit. Like I said, it's premix. The pressure washer and generator are 4-stroke. The chain saw is tempermental enough as it is, and I seldom use it. The truck, however, does not have a catalytic converter. It was removed by the previous owner when the twin Thrush (loud) pipes were added. An octane booster would probably help, but then there's the question of possible harm to the O2 sensor. I'm thinking of adding an additive to it and just take it out as a spare tank and see if the motor likes it. If not, I can always switch back to the regular tank. The premix is only 6 months old at the most. I'm going to get a Mr. Funnel, as well.
Any ideas out there about additives? Any reason I shouldn't try this?
Thanks for all your help, so far, as I think the comments (well, most of them LOL) could be helpful to others.