Luther Automotive Group, the largest new and used dealership group in the Midwest, has joined Rahal Letterman Lanigan Racing as the primary sponsor of Graham Rahal's No.15 Honda at Iowa Speedway on July 8 and as an associate sponsor for Rahal's entry for the full 2018 season. "We are proud to be part of the Rahal Letterman Lanigan Racing family and do our part to support Graham and Takuma as well as Bobby, David and Mike," said David Luther, president of Luther Automotive Group. "We're honored to be associated with such as wonderful organization and are looking forward to the start of the IndyCar Series season as well as the race at Iowa Speedway." "Luther...
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