Unser has led 646 laps at the Indianapolis 500. As of 2005, this is the most of any driver. Unser is also one of five drivers to win consecutive 500's.
Unser holds the record of being the oldest driver to ever win the 500 at 47 years old (1987), breaking the previous record set by his brother Bobby.
Unser also won the Champcar championship in 1970 and 1983.
Unser was the 1978 IROC champion.
- 1979 - Chaparral Racing - 1 win, 2085 points, 5th in championship
- 1980 - Longhorn Racing - 1153 points, 8th, best finish: 3rd
- 1981 - Longhorn Racing - 90 points (new system), 10th, best finish: 2nd
- 1982 - Longhorn Racing - 125 points, 7th, best finish: 3rd
- 1983 - Penske Racing - 1 win, 151 points,
- 1984 - Penske Racing - 76 points, 9th, best finish: 3rd (x2)
- 1985 - Penske Racing - 1 win, 151 points,
- 1986 - Penske Racing - no score
- 1987 - Penske/Porsche/Granatelli - 1 win, 39 points, 13th
- 1988 - Penske/Granatelli - 22 points, 19th, best finish: 3rd
- 1989 - Penske Racing - 14 points, =16th, best finish: 7th
- 1990 - Patrick Racing - no score
- 1991 - Foyt Racing - no score
- 1992 - Penske/Menard - 16 points, 15th, best finish: 3rd
- 1993 - King Motorsports - 1 point, =32nd, best finish: 12th
- 1994 - Arizona Motorsports (no starts)
2 championships, 4 victories.
- 1965 - 9th
- 1966 - 12th (crash)
- 1967 - 2nd
- 1968 - 26th (crash)
- 1970 -
- 1971 -
- 1972 - 2nd
- 1973 - 20th (piston)
- 1974 - 18th (valve)
- 1975 - 16th (connecting rod)
- 1976 - 7th
- 1977 - 3rd
- 1978 -
- 1979 - 22nd (transmission)
- 1980 - 27th (cylinder)
- 1981 - 17th
- 1982 - 5th
- 1983 - 2nd
- 1984 - 3rd
- 1985 - 4th
- 1986 - 22nd (handling)
- 1987 -
- 1988 - 3rd
- 1989 - 24th (clutch)
- 1990 - 13th
- 1992 - 3rd
- 1993 - 12th
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