Mileage does. A car's mpg keeps dropping with each added bit of ethanol. My daily driver's mileage drops 1 mpg with E10.
Same 1 mpg drop between Summer and Winter gas.
Summer E-0 to Winter E10 is a 2 mpg swing [in a 17 mpg SUV].
If you can't buy straight gas locally, you can remove the ethanol using a large jug, water and food dye.
You need to do this if you ever plan to store a car for months.
In the Fall, I drive the other car to 1/4 tank or less, add 5 gallons of 93 that I've removed the ethanol from, and add a splash of Stabil.
It's a lot of hassle. And all that just so we can increase our dependence on oil, hurt the environment, and make gas more expensive. It hardly seems worth it.
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