It's happening a lot now with the cost of gas going up. Some people are getting 40% ethanol in regular gas or lots of water or other junk.I accidently bought a tank full of E15 gas instead of E10 the other month. I lost 5 miles per gallon on that tank, and the car ran like sh*t. I did not save any money.
Also, I now know where to find pure gas. ( no Ethanol ) If That happens again I'll add Pure Gas to fix it.
If anyone wants to find pure gas near you - go to Pure-gas.org - ethanol-free gasoline in the U.S. and Canada
This is also why you need a flex fuel kit so that your car runs well.
I'm still paying $3/gallon