Quote:
Originally Posted by TestDrive
Don't know what your choices are there, but here in South Dakota, we typically have three choices at the pump.
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Apologies for my forgetfulness in regional octane offerings.
We have 87, 89, and 91-92. I'm thinking about a mid-grade octane boost to prevent the pre-ignition. High-octane variants are generally 20-25 cents more/gallon (and may be cost ineffective). I have a couple of weeks before I fill up, so maybe I'll give mid-grade a try and see what happens...
-Rick