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A-B test: 4 tanks of E0 at 34.6 MPG average. Previous 4 tanks of E10 at 32.5 MPG. Need to do another few tanks of E10 to make it conclusive, but it looks like a 6.5% increase, and the station I found (Grange in Issaquah) doesn't charge any more than the Shell & Chevron right next door.
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