To be truthful the anon comment was correct, and you are 100% wrong and your examples are anecdotal. The stuff is indeed harmful to cars. Any damage to the vehicle mitigates savings from E10 - and yet, we pay to produce E10 with gov't subsidies - so it's a double whammy to the taxpayer. No thanks!
E10 (and corn subsidies in general) are a load of shit that has resulted in diabetes, cancer, and all sorts of other wonderful things. Remind me how that high fructose corn syrup in every product that exists (as a result of subsidies) is working out for you?