He also drove for Lola and McLaren in the USRRC/Can-Am series between 1966 and 1968, and in March 1968 he won the first point-scoring race of the USRRC Group 7 series in the first international race in Mexico City.
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Leitzinger shared the 1999 United States Road Racing Championship (USRRC) championship with teammate Elliott Forbes-Robinson and won the famed Rolex 24 at Daytona: twice with Dyson Racing (1997 & 1999), and once in a Nissan 300ZX (1994) co-driven with Scott Pruett, Steve Millen and Paul Gentilozzi.