Because Iowa is actually the best state in the union. You didn't know that? I found this out when I went to a gas station when I first got here. You see, at least for now because this may change soon, Iowa 87 octane and 91/93, whichever your station offers, is ethanol free, or is supposed to be at least. Plus is 10% ethanol, which is what most every other state offers any way in their gas (or some variation between 5-10 is what you'll find). But because Iowa has so much corn, plus ends up being cheaper because of the availability of ethanol and subsidies from the state.
So that was no accident, plus is cheaper than regular. The station I usually used in Delaware said their gas contained up to 10% ethanol so I doubt I'll see any big drop in gas mileage (actually got 25 MPG the last leg in Iowa with some city driving thrown in so that's normal for my car), I always get higher octane now, and I spend the least. Wins all around.

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