how will ethanol affect my fuel mileage ?

I've researched a lot because a gas station just opened up in town that sells it for .90c cheaper and I drive 300 miles per day in a non flex fuel dodge caravan . And I started using it in January.

From what I've found it had to be 25% cheaper to be worth it, and it is totally fine to run it in your non flex fuel vehicle as long as it's no more than like 25 years old. Since then all fuel lines have been made to cope with ethonol because they put 10% in almost all gas. The only thing flex fuel cars do is let's the computer know your running it so it knows why your using more fuel than you should be. So if I run 100% E85 my check engine light will come on and say my engine is running lean. Other then that no issues unless the temp drops below 0℉, then you will have to crank it longer to get it to start. I will admit that my van sputters on starting when I'm using straight E85 but never has failed to start. So my advice is to just pump it in no kit. I've driven 40,000 miles using it about 50% of the time and my van is still running perfect