I will only use E10 when I can be certain the fuel will be all used up very quickly (within a week for 95 E10, within 2 weeks for 98 E10)
Because the moment E10 is refined/blended it starts to deteriorate and contaminate.
If you use E10 and car starts to ping or run poorly, the fuel's contaminated/expired.
the octane rating is tested on the final product, not the components, so 88+10% Ethanol is still 91.l
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