American Grand Prize
Wauwatosa Road Race Course
7.88 Mile Road Course
52 Laps/409.76 Miles
October 5, 1912
| Finish | Start | Driver | Car # | Sponsor/Name | Chassis | Engine | Laps | Status |
Points |
| 1 | 9 | Caleb Bragg | 41 | Fiat | Fiat | Fiat | 52 | 5:59:27.44 68.397 | |
| 2 | 8 | Erwin Bergdoll | 40 | Benz | Benz | Benz | 52 | 6:14:58.38 65.566 | |
| 3 | 11 | Gil Andersen | 43 | Stutz | Stutz | Wisconsin | 52 | 6:15:22.47 65.496 | |
| 4 | 12 | Barney Oldfield | 37 | Fiat | Fiat | Fiat | 52 | 6:19:54.69 64.714 | |
| 5 | 7 | George Clark | 39 | Mercedes | Mercedes | Mercedes | 50 | Flagged | |
| 6 | 10 | Joe Horan | 42 | Benz | Benz | Benz | 47 | Flagged | |
| 7 | 5 | Ralph DePalma | 35 | Mercedes | Mercedes | Mercedes | 51 | Wrecked backstretch | |
| 8 | 3 | Ted Tetzlaff | 33 | Fiat | Fiat | Fiat | 30 | Broken radius rod | |
| 9 | 2 | Louis Fountaine | 32 | Lozier | Lozier | Lozier | 21 | Sprung steer knuckle | |
| 10 | 4 | Hughie Hughes | 34 | Mercer | Mercer | Mercer | 16 | Broken fuel line | |
| 11 | 6 | Spencer Wishart | 36 | Mercedes | Mercedes | Mercedes | 3 | Broken drive shaft | |
| 12 | 1 | Bob Burman | 31 | Benz | Benz | Benz | 2 | Broken piston | |
| -- | -- | Bob Burman | 42 | Benz | Benz | Benz | X | Relieved Horan | |
| -- | -- | David Bruce-Brown | 37 | Fiat | Fiat | Fiat | -- | Wrecked practice - fatal | |
| -- | -- | Harry Nelson | 32 | Lozier | Lozier | Lozier | -- | Driven by Fountaine | |
| -- | -- | Ralph Mulford | 38 | Knox | Knox | Knox | -- | DNS, ignition | |
| -- | -- | Joe Dawson | X | X | X | X | -- | Did not appear |
Known riding mechanics in this race:
| Finish | Start | Driver | Mechanic | Car # | Sponsor/Name | Chassis | Engine | Laps | Status |
| 1 | 9 | Caleb Bragg | Capra | 41 | Fiat | Fiat | Fiat | 52 | 5:59:27.44 68.397 |
| 2 | 8 | Erwin Bergdoll | Kramer | 40 | Benz | Benz | Benz | 52 | 6:14:58.38 65.566 |
| 5 | 7 | George Clark | Graham | 39 | Mercedes | Mercedes | Mercedes | 50 | Flagged |
| 6 | 10 | Joe Horan | DeCourcey | 42 | Benz | Benz | Benz | 47 | Flagged |
| 7 | 5 | Ralph DePalma | Tom Alley | 35 | Mercedes | Mercedes | Mercedes | 51 | Wrecked backstretch |
| 8 | 3 | Ted Tetzlaff | George Hill | 33 | Fiat | Fiat | Fiat | 30 | Broken radius rod |
| 10 | 4 | Hughie Hughes | Jack Jenter | 34 | Mercer | Mercer | Mercer | 16 | Broken fuel line |
| 11 | 6 | Spencer Wishart | S. F. Brock | 36 | Mercedes | Mercedes | Mercedes | 3 | Broken drive shaft |
| 12 | 1 | Bob Burman | Tony Janette | 31 | Benz | Benz | Benz | 2 | Broken piston |
| -- | -- | Harry Nelson | Louis Fountaine | 32 | Lozier | Lozier | Lozier | -- | Driven by Fountaine |
| -- | -- | David Bruce-Brown | Tony Scudellari | 37 | Fiat | Fiat | Fiat | -- | Wrecked practice - fatal |
| -- | -- | Ralph Mulford | Billy Chander | 38 | Knox | Knox | Knox | -- | DNS, ignition |