Switch back to the non-oxy fuel. You'll pick up fuel economy, and it could very well be the reason your car started pinging.
The Super America in Champlin offers premium non-oxy as well.
When they say oxygenated it really means "ethanol 10%+". Since ethanol has roughly 1/2 the energy that gasoline does, when you use a 10% ethanol blend, you're actually running 5% leaner. That coincides with a drop in fuel economy for EFI cars as the computer compensates. Or new pistons if you have a snowmobile or other 2cyl engine.
Ethanol is garbage. Totally useless, except as a renewable reasource. Since we live in a state chock full of corn farmers, getting rid of the oxy fuel is pretty damn hard, the farmers really like those artificial subsidies.
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