DAYTONA BEACH, Fla. -- The Sprint Cup Series' introduction to E15 Ethanol-blended Sunoco race fuel began in earnest during the past three days of Preseason Thunder at Daytona International Speedway.
And while NASCAR teams, their manufacturers and engine suppliers have had a lot of experience working with the substance, it appears the intricate details of the switchover from unleaded race fuel will be intriguing.
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