I've never had the slightest problem with ethanol containing fuel, and I tend to drive my cars 'til the wheels fall off. Honda Civic, Toyota Corolla, Acura Integra (Honda again), and Ford Ranger (which I think is still made by Mazda) are our latest ones. I put 200K on the Ranger, 175K on the Acura, and my wife's Toyota is getting up to 100K pretty quickly (she has a rather long commute). My Civic is pretty new and my commute is rather short, so not many miles on that yet.
I haven't either, and we've had E10 fuel in Indiana since the late 1980s. The only thing I can think of is that we get a better grade of alky here in Indiana, it's all grown and processed locally.
At the end of 2011 the subsidy for domestic ethanol expired as did the tariff on imported ethanol. Ethanol plants in Indiana are closing up faster than K-marts in the 1990s. I suspect imported Brazilian sugar cane ethanol will be an increasing factor.
2005 Honda Accord, 2009 Honda Accord, 2010 Ford F-150. ALL had the same codes, an O2 sensor in the exhaust chain leading some to believe the catalytic convertor is going bad.
If you google 02 sensors and ethanol, you’d be likely to run across a term “wide-band” 02 Sensor and ethanol’s effects on it....
You won’t find much else because the ethanol industry doesn’t like publicity about ethanol destroying seals, gaskets, O rings, fuel lines, and sensor, etc.....
I finally quit using QTrip because a mech engineer friend told me they’ve been caught using much more ethanol in their gas than they report (up to 10% is their limit).....
I found that using brands of gas that aren’t discount like Q and Racetrak, my sensor trips are not near as frequent....
Three cars/trucks - same problems in 5 years....that’s not chance...