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| Date | Sunday 24 March 1991 |
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| Start time | 14:00 |
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| Event | Brazilian GP |
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| Circuit | Interlagos |
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| Event Format | Race of 71 laps |
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| Race | 2 of 16 |
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| Championship race | 502 |
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| Laps | 71 |
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| Circuit Perimeter | 4325 m |
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| Race Distance | 4325 × 71 = 307.075 km |
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| Grid Format | 2-2-2-2 (staggered) |
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| Pole Position | Left |
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| First Corner | Left |
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| Track Direction | Anti-clockwise |
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| Weather | Overcast, Mild, Wet |
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| Entries | 34 |
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| Qualifiers | 26 |
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| Finishers | 13 |
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| Championship Debutants | None |
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| Milestones | Éric Bernard - 20th Race Entry (Driver)
AGS - 100th Race Entry (Car Manufacturer)
Canon Williams Team - 100th Race Entry (Entrant)
Gabriele Tarquini - 50th Race Entry (Driver)
Goodyear - 250th Win (Tyre Manufacturer)
Honda Marlboro McLaren - 100th Race Entry (Entrant)
Mauricio Gugelmin - 50th Race Entry (Driver)
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| Records Broken |
1. Most Laps Led –  Ayrton Senna (2260)
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| Records Extended |
1. Most Constructors' Championship Points Scores – Ferrari (422),
2. Most Drivers' Championship Points Scores – Ferrari (554),
3. Most Drivers' Championship Points Scores –  Alain Prost (110),
4. Most Constructors' Championship Points Scores – Alain Prost (110),
5. Most 4th Place Finishes – Ferrari (100),
6. Most 6th Place Finishes – Ferrari (59),
7. Most 12th Place Finishes – Brabham (25),
8. Most Race Entries – Lotus (1208),
9. Most Race Entries –  Riccardo Patrese (211),
10. Most Poles – Ayrton Senna (54),
11. Most 3rd Place Qualifications –  Nigel Mansell (25),
12. Most 5th Place Qualifications – Ferrari (112),
13. Most 6th Place Qualifications – Ferrari (93)
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