My S8 is running just fine on it. No loss of power, although seems to be doing around 20mpg now compared to its usual 22. I should note that although it ought to have Super, the butt dyno says no difference between 95 and 98 in this one, probably because it only has 13K on the engine. Since ethanol resists knock, 95 E10 is better in a high compression engine than 95 E5 was and may be equivalent (in terms of knock) to 98/99 E5, albeit with higher fuel consumption. Engines with more miles on them do tend to respond better to higher octane though.
E10 is definitely not suitable for older classics, but we know that. They don't have compatible materials in the fuel system, but Audis from at least the mid 90s are just fine.
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