In Brief: Jerez Test Day Four
By Honda Racing F1
September 21 2008
After two days of testing in the RA108, Alex yesterday drove the car with the team's KERS development system in place. Honda Racing F1's Austrian test driver completed 51 laps, evaluating the KERS system at various levels and gathering valuable data.
| Pos | Driver | Team | Engine | Best Lap | Gap | |
| 1 | de la Rosa | McLaren | Mercedes | 1:18.992 | ||
| 2 | Heidfeld | BMW Sauber | BMW | 1:19.250 | 0.258 | |
| 3 | di Grassi | Renault | Renault | 1:19.280 | 0.288 | |
| 4 | Vettel | Toro Rosso | Ferrari | 1:19.470 | 0.478 | |
| 5 | Buemi | Red Bull | Renault | 1:20.005 | 1.013 | |
| 6 | Glock | Toyota | Toyota | 1:20.482 | 1.490 | |
| 7 | Wurz | Honda | Honda | 1:22.658 | 3.666 | |
| 8 | Rosberg | Williams | Toyota | 1:22.806 | 3.814 |
