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Senior Member
Access all undiluted engine potential by using proper fuel. Ethanol in most of the gas (up to 15%) provides less energy and equals to less power at worse MPG. Now, the price of pure gas is higher and wont be offset by your mileage saving but you will notice the difference in the way your truck runs. I challenge anyone here to try 2 tanks of pure (ethanol free 87 grade) and then try to go back to the same regular 87 or any other grade after that. Keep in mind any regular gas in US has ethanol unless separate pump specifically says "Ethanol Free". Good luck