I've got a question about gas sold at Casey's General Store. They sell an 88 octane unleaded, which sells for 10 cents a gallon less than their 87 octane unleaded. The 87 octane contains 10% ethanol, while it appears the 88 octane contains no ethanol. I was under the impression that straight gasoline without ethanol was more expensive than gas with ethanol, so how can the 88 be less expensive than the 87? I was told this morning, and I don't know how accurate this is, that the 88 has some other additive. There is no indication on the pump of this gas having any additive like the pump with the ethanol containing gas has, and I thought it was a law that any additive had to be posted on the pump. Is there a loophole in the law that allows for this additive without listing it? I find it hard to believe that straight gasoline would be less expensive than that with ethanol...