I don't mean to keep prodding you, but what's your opinion of E10 ethanol gas, and any adjustments needed to either the heat range or the electrode gap?

In California, it used to be 5.7% ethanol max. But, in January 1, 2010, 10% was optionally allowed. Since then, I've noticed worse gas mileage.

With ethanol, it seems reducing the gap would be prudent.

Have you heard any insider talk from Mercedes engineers (not marketing people) about what E10 is doing to our cars?

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