Bob,
What you call "E10" is what we call gasoline. For years, many years, in fact, with the exception of aviation fuels, marine fuels, and racing fuels, all normal "on the road gas" typically is ~10% ethanol. Not going to start a debate on the intelligence or politics of it all, just stating a fact.
Here in NC, racing country (most of the NASCAR teams are here) many stations have (some are high octane), ethanol free fuel available, but you have to seek it out. Some marinas carry it too, but the prices are considerably higher and I'm not certain if the "dock pumps" charge road fuel tax. You cannot put aviation fuel into a car since the FBOs won't sell it except when dispensed into an airplane.
It is what it is. Though I cannot attribute it specifically to the E10 I've been using for 20 years in my Pagoda, I did have one fuel line leak a couple of years back; the one that connects from the rear fuel pump to the hard line at the back of the car. It was a $20 part, and a quick replacement.
Just as a curiosity, one of our cars is a "flex fuel vehicle" and because it was available and cheap this summer, I tried a tank of E85. I was expecting to get much poorer gas mileage, but I did not--I was pleasantly surprised that the mileage (according to the onboard calculator) was pretty much the same as with E10.
