Al Unser led 66.8 percent of all championship laps and won 10 races in 1970, giving his USAC campaign a statistical edge no rival has matched.
Al Unser led 1,527 of 2,287 laps during the 1970 USAC championship. His extraordinary 66.8 percent share remains the strongest measure of season-long control in Indy car’s historical record book.
That figure produces a different answer in the G. O. A. T. debate. Career totals favor drivers such as A. J. Foyt and Mario Andretti, while championships bolster the cases for Foyt and Scott Dixon. Unser gets the nod for the greatest individual season because nobody else controlled an entire campaign so completely.
Two thirds of a season in front
Unser’s 1970 total is staggering on its own. Leading 66.8 percent of all available laps meant running at the head of the field for roughly two of every three championship laps.
He also won 10 races that year, tying Foyt’s 1964 USAC season for the most victories in a championship campaign across the 1946 to 2014 record-book window.
No other season pairs those benchmarks.
The gap to Andretti matters
Mario Andretti offers the closest comparison. He led 1,142 of 2,083 laps in 1966, a 54.8 percent share, and won eight races.
Unser’s 66.8 percent tops Andretti’s 54.8 percent by 12 percentage points. That is a substantial gap between the top two entries in a historical category, particularly because both seasons came in USAC competition.
Michael Andretti ranks third by percentage. During his 1992 CART campaign, he led 1,136 of 2,110 laps, or 53.8 percent. Yet he did not win the championship, showing that control at the front does not always produce the final title.
Foyt won as often, led less
Foyt’s 1964 season provides the clearest head-to-head test. He equaled Unser’s 10 victories but led 861 of 1,750 laps, or 49.2 percent.
That takes nothing away from Foyt’s year. His 10 wins set a peak that no driver surpassed through the 2014 historical window. Unser, though, controlled a greater share of his season between the checkered flags, finishing with 666 more laps led and a 17.6 percentage-point advantage over Foyt.
Tony Bettenhausen’s 1951 campaign falls between Michael Andretti and Foyt by percentage. Bettenhausen led 851 of 1,719 laps, or 49.5 percent, and won eight times.
Different eras complicate the ranking
Raw lap totals benefit seasons with longer races, and win totals depend on schedule size. Percentage of laps led limits that distortion by measuring control against the opportunities available during each campaign.
It cannot eliminate every difference. Unser competed in a USAC championship that featured disciplines and conditions unlike those in the modern NTT INDYCAR SERIES. Equipment reliability and competitive depth changed across the AAA, USAC and CART periods as well.
Percentage led is therefore the cleanest available cross-era measure of sustained authority, rather than a perfect comparison. On that measure, Unser’s advantage is decisive.
A peak distinct from career greatness
Unser’s 1970 season does not settle the wider driver ranking. Foyt’s seven championships make the case for longevity. Andretti’s 67 poles and 7,595 career laps led define another form of supremacy, while Dixon’s Indianapolis 500 record of 677 laps led spans 23 starts.
Unser also stands among the Indianapolis record holders. His four victories, earned in 1970, 1971, 1978 and 1987, tie Foyt, Rick Mears and Helio Castroneves for the event maximum.
The next benchmark is straightforward: a future IndyCar champion must lead more than 66.8 percent of a season’s laps to knock Unser’s 1970 campaign from the top of this ranking.
