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.

In 1998, he was inducted into the International Motorsports Hall of Fame.

CART career results 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, 1st 1984 - Penske Racing - 76 points, 9th, best finish: 3rd (x2) 1985 - Penske Racing - 1 win, 151 points, 1st 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.