Quote:
Originally Posted by RH77
Or is there option "E"?
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Don't know what your choices are there, but here in South Dakota, we typically have three choices at the pump.
- 87 octane "May contain up to 10% Ethanol" Currently $2.18 per gal.
- 85 octane Regular Unleaded. Currently $2.28 per gal.
About 10 cents more than 10% Ethanol.
Must still contain some Ethanol, because ethanol replaced MTB.
- 89 octane Premium Unleaded. Currently $?.?? per gal. (will check tonight)
About 20 cents more than Regular Unleaded.
Also must still contain some Ethanol, since ethanol replaced MTB.
With gas prices low, my % drop in FE with 87 octane is less than the % price difference from Regular Unleaded. I've never tried timing adjustments based on the octane difference between the two.