NASCAR's hottest driver continued to turn up the heat as 51 NASCAR Sprint Cup teams tested Tuesday at Charlotte Motor Speedway in preparation for the Oct. 11 Bank of America 500.

Atop the speed chart at the end of day one of the two-day session was the winner of the past two NASCAR Sprint Cup Series races, Greg Biffle, with a speed of 185.605 mph.

"We unloaded with the All-Star and Coca-Cola 600 setup in the car," said Biffle. "We figured that was a great place to start since we finished second in both of those events and the car is super-easy to drive, and it has a lot of speed. I'm pretty happy about that for starters.

"I think you're going to a see a great race here, I really do," Biffle continued. "This race track and this tire are really starting to come together. I think the 600 and the All-Star race were pretty good races too, chasing guys down at the end. Kasey (Kahne) and I had a pretty good race in both of them, but I think you're going see another pretty exciting race in the Bank of America 500."

Many teams were anxious to get on the track for the evening session as the cool air temperatures and cover of darkness will be the same conditions teams will likely face when they return next month for the only Saturday night race in the Chase for the Sprint Cup.

Second on the chart was a driver who has yet to log a start in the NASCAR Sprint Cup Series. Scott Speed, in the No. 82 Red Bull Racing Toyota turned a best lap of 184.881 mph.

Biffle's Roush Fenway Racing teammate, Carl Edwards, was third-fastest with a speed of 184.231 mph and fourth-fastest was another Sprint Cup Series greenhorn, Brad Coleman, in the No. 40 Ganassi Racing Dodge, with a speed of 184.068 mph.

Rounding out the top five were Elliott Sadler and Tony Stewart who ran identical speeds of 183.836. Each of the of top-10 fastest speeds of the day occurred during the evening session.

There were no incidents on the track during the seven hours of testing and only a brief caution period during the afternoon session for debris on the racing surface.

NASCAR Sprint Cup testing continues from 1 p.m. to 9 p.m. Wednesday and the frontstretch grandstand will be open to fans free of charge.

Also, Bank of America 500 ticket holders can show their ticket at Gate 25, just behind the backstretch near Turn 3 and watch Sprint Cup testing from pit road. The Charlotte Motor Speedway ticket office will be open extended hours Wednesday from 9 a.m. to 9 p.m.

Tickets for the Oct. 11 Bank of America 500 can be purchased by calling the track ticket office at 1-800-455-FANS or online.

The top-10 official speeds of the day:

1. Greg Biffle, 16, 185.605; 2. Scott Speed, 82, 184.881; 3. Carl Edwards, 99, 184.231, 4. Brad Coleman, 40, 184.068; 5. Elliott Sadler, 19, 183.836; 5. Tony Stewart, 20, 183.836; 7. Kyle Busch, 18, 183.824; 8. Mark Martin, 8, 183.811; 9. Ryan Newman, 12, 183.524; 10. Joe Nemechek, 78, 183.150.