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Originally Posted by Quickurt
We've done a gazillion threads about octane requirements. If you track it, you will lose a higher percentage in gas mileage with the lower grade fuels, than you save in cost difference. My DD (daily driver) is also a high test user (Mazda turbo) and I lose 10% gas mileage with a 2.5% cost savings when I use mid-grade. It's not that there is no savings, but just the opposite, it costs a penny more, per mile driven, to use the cheaper gas. (4.20 - 23 mpg, 4.10 - 20.5 mpg)
Don't spend more to risk damaging your VERY expensive engine.
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So I should use higher Octane gas all the time? Alright I'll keep that in mind thanks.
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