My wife and I have done the same thing with the ethanol (crapanol). We go to Missouri for a week or two to visit our son and his family. We can't find a station with 100% gas, and were told that Missouri requires that all stations have to sell crapanol. The mileage goes to pot, and it takes 2-3 tanks of real gas to get the mileage back up after we get back home to Oklahoma. Speaking of interesting observations, that difference in mileage means that you are actually burning more gasoline when you use crapanol, which is 90% gas. In the wrangler's case, he would use 1 gallon of 100% to go 15 miles. He would use 1 gal. plus 4/11 (or .36) gal. of crapanol. Since crapanol is .9 gas, he would use 1.36X.9, or 1.22 gal. of gas. The whole idea of crapanol is to reduce emissions, but instead it increases the amount of gas burned when you use it, making for MORE emissions, rather than less. And the kicker is that our taxes pay for the increased cost of production in making crapanol, as well as paying for the incentive bonus paid by the government to the oil companies in order to keep the cost at the pump lower than the 100% gas.
In all, it's just a major boondoggle by the government, using up more resources (including the corn lost) AND causing more pollution, in addition to the problems that crapanol causes to the hoses and mechanical parts under the hood.
End of rant.