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We have E0 91 octane and E10 91 octane available in Australia.
Although my previous vehicles haven't seen much difference between the two fuels, the '98 Mazda I'm driving now sees up to 10% better mileage with E0, than the E10, for about 3.5% higher cost.
Maybe it's because we didn't have E10 when this car was produced? Those with newer model cars, that are tuned to run with E10, may get very different results.
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