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Likewise Opti 2 recommends 100:1 for all 2 cycle small engines. We take that with a big grain of salt as it's likely EPA-influenced to cut down on emission pollution. We like to run as rich as the saws need, just below where they would start smoking. So we're somewhere between 50:1 and 40:1 even...

We run 40:1 (perhaps a slightly richer 42 or 45:1) using Super Unleaded 93 octane, preferably with no ethanol. We usually buy a 1 gallon jug of 2 cycle oil at a time. For the last 6 months, we've been running Opti-2 oil, before that was Husqvarna Low Smoke. Now we got a good deal on 3 cases of...