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Well my tank of E14 is now gone and I have the results. No drop in mileage!
22.3 MPG on E10 with my normal routine
22.3 MPG on E14 with a few long hard WOT runs for testing purposes
Also no check engine light, hards starts, rough driving or any other side-effects so now I've filled up with E21 and will give that blend a try.
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