Johnson has the highest winning % of active drivers:

With seven wins in 2008, #48-Jimmie Johnson has passed #24-Jeff Gordon on the all-time list for Cup Series win percentage. Overall, Johnson is eighth all-time in win percentage [drivers with over 100 starts]: 1. Herb Thomas — 21.05% (48 wins, 228 starts) 2. Tim Flock — 20.86% (38/187) 3. David Pearson — 18.26% (105/574) 4. Richard Petty — 16.89% (200/1184) 5. Fred Lorenzen — 16.46% (26/158) 6. Fireball Roberts — 16.02% (33/206) 7. Junior Johnson — 15.97% (50/313) 8. Jimmie Johnson — 15.75% (40/254) 9. Jeff Gordon — 14.89% (81/544) 10. Cale Yarborough — 14.82% (83 / 560) (stats from Racing-reference.info and NASCAR Statistics)(11-9-2008)