Here's the dilema, in upstate NY, some pumps say 10% ethanol. I only run 93 in the sled, but does the higher octane fuels (89 or 93)or only 87 contain the 10% ethanol. I've researched citgo and all grades seem to contain ethanol to some degree. Anyone out there working for an oil/gas company could clarify or any input from anyone would help. Most new injected sleds have an ethanol fuel resistor option, but can only be "plugged in" for better performance if you know you are running non-oxygenated fuel, at least on a 10 600 CFI