ɪn tˈuː θˈaʊzənd sˈɪkstiːn, mˈɪlɚ kˈoʊfˈaʊndᵻd mˈɪlɚ vˈɪnɐtˌɪɹi mˈoʊɾɚspˌoːɹts wɪð fˈɔːɹmɚɹ ˌɪndiənˈæpəlˌɪs kˈoʊlts kˈɪkɚɹ ˈædəm vˈɪnɐtˌɪɹi, wɪððə tˈiːm ɪnˈɪʃəli ˈɛntɚɹɪŋ kˈɑːɹz ɪnðə fˈɔːɹmjʊlə fˈoːɹ juːnˈaɪɾᵻd stˈeɪts tʃˈæmpiənʃˌɪp, bˌʌt lˈeɪɾɚ mˈuːvɪŋ tə ðə ɹˈoʊd tʊ ˈɪndi wɪð ˈɛntɹiz ˌɪntʊ ðə jˈuː.ˈɛs. ˈɛf tˈuː θˈaʊzənd nˈæʃənəl tʃˈæmpiənʃˌɪp ænd ðɪ ˈɪndi pɹˈoʊ tˈuː θˈaʊzənd tʃˈæmpiənʃˌɪp.
In 2016, Miller co-founded Miller Vinatieri Motorsports with former Indianapolis Colts kicker Adam Vinatieri, with the team initially entering cars in the Formula 4 United States Championship, but later moving to the Road to Indy with entries into the U.S. F2000 National Championship and the Indy Pro 2000 Championship.