Lots of capital letters doesn't make your argument any more forceful or any more correct. The Highlander owner's manual states "For improved vehicle performance, the use of premium unleaded gasoline with an Octane Rating of 91 (Research Octane Number 96) or higher is recommended." It certainly does save us money, since the gas mileage has improved more than enough to recoup the extra 10 cents per gallon for 89 octane (haven't tried 91 yet, since we want to experiment with the 89 for a few tanks). And I never said it gave us more horsepower, nor did I say anything about energy. It is simply more efficient than 87 octane in our experience. Using higher octane than your engine is designed for doesn't give any benefit, and can cause excess emissions. However, the Highlander is designed for the higher octane, and therefore gets improved performance (as we've seen with ours in the real world).
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Originally Posted by SomervillePrius
Ok, I don't know what the highlander is rated for BUT using HIGHER octane gas then what a car is rater for will NOT i repeat NOT help your gas milage and NOT I repeat NOT give you more horse power. Higher Octane is used for engines that require higher compression, this way they can be designed to run at higher compression generating more horsepower but it will NOT save gas. Higher octance gas actually has less energy in it (the octane rating specifies at what compression it will explode and not energy level!).
So don't use higher octane gas, it will not help you, it will pollute more and cost you more money.
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