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E85 is 15% gasoline/85% ethanol. Vehicles you see labeled as Flex Fuel can run this fuel. Depending on your location you may find it at your local gas pumps. Here in NC you will see it at a lot of the Sheetz gas stations.
To be able to utilize regular gas (E10) and E85 or any blend in between you need to install a Flex Fuel sensor and program the ECM to utilize it. On the LT1 this is one of the best bang for the buck modifications you can do.
GM doesn't deal with mods very well as it pertains to warranty. Assume it is pay to play. If it's your daily driver and you can't afford to fix it on your own don't risk it. That may sound harsh but it is realistic. The days of leveraging ignorance are long gone.
Tim
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