John F. Duff
Birthplace: Kiukang, China
Born: January 17, 1895
Died: January 9, 1958
John Duff
John F. Duff
Birthplace: Kiukang, China
Born: January 17, 1895
Died: January 9, 1958
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| Year | Series | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles | Points | Standing |
| 1926 | AAA | 3 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 155 | 17 | |
| Total | 3 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 155 |
| Track Type | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Board Oval | 2 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | |
| Brick Oval | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 0 |
| Series | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| AAA | 3 | 1 | 0 | 0 | 1 | 0 | 0 | 0 |
| Start # | Date | Track | Type | Series | Car # | Sponsor/Name | Chassis | Engine | Start | Finish | Laps | Status |
Points |
| 1 | 5/30/1926 | Indianapolis | BR | AAA | 18 | Elcar | Miller | Miller SC | 28 | 9 | 147 | Flagged - rain | 15 |
| 2 | 6/12/1926 | Altoona 1 | BO | AAA | 24 | Miller | Miller | Miller SC | 13 | 3 | 200 | 2:16:24.48 109.964 | 140 |
| 3 | 7/5/1926 | Rockingham 2 | BO | AAA | 24 | Elcar | Miller | Miller SC | 15 | 13 | 64 | Wrecked | |
| -- | 7/17/1926 | Atlantic City 5 | BO | AAA | 24 | Elcar | Miller | Miller SC | -- | -- | -- | Withdrew | |