John William Mahler
Birthplace: Alpha, Iowa
Born: November 16, 1936
Died: February 6, 2024
John Mahler
John William Mahler
Birthplace: Alpha, Iowa
Born: November 16, 1936
Died: February 6, 2024
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| Track | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Atlanta-PO | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Castle Rock | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 0 |
| Indianapolis | 4 | 8 | 0 | 0 | 0 | 0 | 0 | 14 | 0 |
| IRP | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 |
| Langhorne | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 0 |
| Mexico City | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 13 | 0 |
| Mid-Ohio | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 19 | 0 |
| Milwaukee | 6 | 2 | 0 | 0 | 0 | 0 | 0 | 11 | 0 |
| MIS | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 9 | 0 |
| Ontario | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 0 |
| Phoenix-PIR | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 19 | 0 |
| Pocono | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 14 | 0 |
| Rafaela | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 16 | 0 |
| Riverside | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 27 | 0 |
| Sears Point | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 13 | 0 |
| Trenton | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 0 |
| Watkins Glen | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 14 | 0 |
| Chassis | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Bea | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 0 |
| Eagle | 18 | 10 | 0 | 0 | 0 | 0 | 0 | 6 | 0 |
| Finley | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Lion | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| McLaren | 7 | 2 | 0 | 0 | 0 | 0 | 0 | 8 | 0 |
| Penske | 8 | 4 | 0 | 0 | 0 | 0 | 0 | 13 | 0 |
| Unknown | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 12 | 0 |
| Vollstedt | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 23 | 0 |
| Webster | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 25 | 0 |
| Engine | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Chevy | 11 | 4 | 0 | 0 | 0 | 0 | 0 | 6 | 0 |
| DGS | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 0 |
| Ford | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 23 | 0 |
| Offy | 25 | 12 | 0 | 0 | 0 | 0 | 0 | 8 | 0 |