Winter gas is more volatile than summer gas. (deliberately blended to be)
Fresh gas is more volatile than stale gas. (the most volatile parts have already evaporated)
Higher octane more volatile? No, if anything it is less volatile as the same properties that make it burn slower probably reduce volatility. Any difference is probably negligible.
So when you replace your stale summer blend regular with fresh winder blend premium, you have increased the volatility. But it isn't because you wasted money buying premium.
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Today's Featured Article - Tuning Up Your Tractor: Cooling and Fuel Systems, Hoses and Belts - by Curtis Von Fange. Our tractor is coming right along. The old oil and filter has been taken to the recycler and the air filter replacement has breathed new life into our motor. Let's take a closer look, now, at the cooling system since it has to work so hard in the summer heat. Cooling systems can be real cantankerous in their old age. Radiator cores clog up with rust, lime or other mineral deposits and the fins clog up with weed seeds and debris. The metal headers slowly corrode away from years of use and
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