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Well, I just refilled my tank, and got 40 mpg, or nearly 4 mpg better than my previous tank. However, I added a full grill block (made of cellophane tape), which may have played a role. I also would like to think I did a better job in hypermiling, so I'm not sure where to attribute the change.
The change did exist however, especially considering that the increase occurred despite the decrease in temperatures over the last couple of weeks, and my lowering of front tire pressure from 70 (too high, I know) to 65 psi.
And for the record, I went and checked the place where I first filled up when I got the car, and they actually serve E10 (they said 10% ethanol on a sticker) rather than E85, so that site, at least, is an E10 one. I filled up there again instead of at the ethanol free station, and am interested in seeing what my numbers look like when this tank runs dry.
Variables will include driving style, tire pressure (I'm likely going to take the front tires down a bit more to 60 psi to match the rear tires), weight reduction (I've removed a few bits of soundproofing from the trunk), added aero (more tape over gaps and seams in the front of the car), an oil and filter change (which I did over a few hours this weekend), lowered temperatures as we get closer to winter, and of course, the E10 gas.
We'll see how it goes!
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