Greg Leffler
Birthplace: Indianapolis, Indiana
Born: December 27, 1951
Died:
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| Year | Series | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles | Points | Standing |
| 1980 | CART | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 10 | 0 | 184 |
32 |
| Includes | USAC | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 10 | 0 | 150 | 21T |
| 1981 | CART | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 23 | 0 | 0 | NR |
| 1981-82 | USAC | 2 | 3 | 0 | 0 | 0 | 0 | 0 | 9 | 0 | 80 | 29 |
| 1982 | CART | 5 | 2 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 27 | 23T |
| 1983 | CART | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 11 | 0 | 2 | 29T |
| Includes | USAC | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 | 0 | NR |
| Total | 15 | 6 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 443 |
| Track Type | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Dirt Oval | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 9 | 0 |
| Paved Oval | 8 | 5 | 0 | 0 | 0 | 0 | 0 | 10 | 0 |
| Road Course | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 |
| Series | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| CART | 13 | 3 | 0 | 0 | 0 | 0 | 0 | 6 | 0 |
| USAC | 3 | 4 | 0 | 0 | 0 | 0 | 0 | 9 | 0 |
| Start # | Date | Track | Type | Series | Car # | Sponsor/Name | Chassis | Engine | Start | Finish | Laps | Status |
Points |
| 1 | 5/26/1980 | Indianapolis | PO | USAC/CART | 44 | Starcraft RV | Lola | Cosworth | 23 | 10 | 197 | Flagged 140.610 | 150 |
| 2 | 8/31/1980 | Ontario 2 | PO | CART | 44 | Starcraft RV | Lola | Cosworth | 18 | 20 | 118 | Ignition | 20 |
| 3 | 9/20/1980 | MIS 2 | PO | CART | 44 | Armstrong Mould | Lola | Cosworth | 18 | 15 | 68 | Flagged | 8 |
| 4 | 11/8/1980 | Phoenix | PO | CART | 43 | Armstrong Mould | Lola | Cosworth | 11 | 20 | 26 | Wrecked turn 4 | 6 |
| -- | 5/24/1981 | Indianapolis | PO | USAC | 44 | Armstrong Mould | Lola 79 | Cosworth TC | -- | -- | -- | Did not qualify | |
| --/ | 5/24/1981 | Indianapolis | PO | USAC | 43 | Armstrong Mould | Lola | Cosworth TC | -- | -- | -- | Did not qualify | |
| 5 | 8/15/1981 | Springfield | DO | USAC | 43 | Armstrong Mould | X | X | 20 | 9 | 88 | Drive line | 80 |
| -- | 8/30/1981 | DuQuoin | DO | USAC | 43 | Armstrong Mould | X | X | -- | -- | -- | Raced by Sh. Kinser | |
| 6 | 9/12/1981 | ISF | DO | USAC | 43 | Armstrong Mould | X | X | 22 | 11 | 100 | Finished | |
| 7 | 10/31/1981 | Phoenix 2 | PO | CART | 43 | Armstrong Mould | Armstrong | Cosworth TC | 14 | 23 | 25 | Engine | |
| -- | 5/1/1982 | Atlanta | PO | CART | 43 | Armstrong Mould | SEA | Cosworth | -- | -- | -- | DNS, too slow | |
| -- | 5/29/1982 | Indianapolis | PO | USAC | 43 | Armstrong Mould | SEA | Cosworth | -- | -- | -- | Did not qualify | |
| -- | 7/18/1982 | MIS 1 | PO | CART | 64 | Jet Engineering | Eagle 81 | Chevy | -- | -- | -- | DNS, too slow | |
| 8 | 8/1/1982 | Milwaukee 2 | PO | CART | 64 | Jet Engineering | Eagle 81 | Chevy | 19 | 21 | 31 | Lost oil | |
| 9 | 8/29/1982 | Riverside | RC | CART | 64 | Jet Engineering | Eagle 81 | Chevy | 21 | 6 | 78 | Broken valve | 24 |
| 10 | 9/19/1982 | Elkhart Lake | RC | CART | 64 | Jet Engineering | Eagle 81 | Chevy | 23 | 13 | 30 | Engine | 2 |
| 11 | 9/26/1982 | MIS 2 | PO | CART | 64 | Jet Engineering | Eagle 81 | Chevy | 21 | 24 | 7 | Body damage | |
| 12 | 11/6/1982 | Phoenix 2 | PO | CART | 64 | Jet Engineering | Eagle 81 | Chevy | 16 | 13 | 141 | Flagged | 1 |
| -- | 5/29/1983 | Indianapolis | PO | USAC/CART | 64 | Jet Engineering | Eagle 83 | Chevy | -- | -- | -- | Did not qualify | |
| 13 | 7/31/1983 | Elkhart Lake | RC | CART | 64 | Jet Engineering | Eagle 82 | Chevy | 19 | 24 | 14 | Engine | |
| 14 | 8/28/1983 | Riverside | RC | CART | 64 | Jet Engineering | Eagle 82 | Chevy | 21 | 15 | 57 | Broken suspension | |
| 15 | 9/11/1983 | Mid-Ohio | RC | CART | 64 | Jet Engineering | Eagle 82 | Chevy | 27 | 11 | 78 | Flagged | 2 |