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I've used 93 octane most of the time with either Stabil or Startron and "feel" I get really good gas milage. I have ran @150 NM on less than 3/4 tank, estimating maybe 200mi max with running/gunning and trolling plus, my gas sits in the tank a while and agree with Puter, better to start with higher octane and so if it drops to 90 or so after a number of months....still in good shape plus the engine/fuel system stays cleaner.
I have heard that the higher octane should make your motor run hotter at trolling speeds, but have never ran into any problems or have been able to substantiate.
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