Will Power remained on top on the second and final day of IndyCar testing at Barber Motorsports Park on Tuesday.
While running time was again shortened by mist and cold conditions, Power still managed to complete 62 laps with a best effort of 1m07.0608s, improving his day one benchmark by 0.6 seconds.
"Hopefully we found a happy place," said the Penske driver. "Obviously the temperature will be a lot different [when we race here], and I think that brings out imbalances in the car.
"It was so cold today and there was so much grip that I think it was hard to get good reads on changes. It's going to be really tight."
Justin Wilson took the honour of being fastest with the new twin-turbo Honda engine, the Brit falling just 0.0038s short of Power's time.
Scott Dixon lapped within two tenths of Power in third, while 16 drivers in total produced fastest laps within a second of the Australian's benchmark.
Andretti rookie Carlos Munoz managed to complete 121 laps over the two days, the highest of anyone in the field, and said that the experience was good preparation for next weekend's season-opener in St Petersburg.
"I learned a lot these two days," he said. "I'm definitely more comfortable at this test than previous ones. I think we've made a lot of progress, and today was better than yesterday. Each time I get in the car is better than the last."
Pos Driver Team/Engine Time Gap Laps 1. Will Power Penske/Chevy 1m07.0608s 62 2. Justin Wilson Coyne/Honda 1m07.0646s +0.0038s 51 3. Scott Dixon Ganassi/Chevy 1m07.0791s +0.0183s 59 4. Takuma Sato Foyt/Honda 1m07.3314s +0.2706s 57 5. Ryan Briscoe Ganassi/Chevy 1m07.3705s +0.3097s 48 6. Helio Castroneves Penske/Chevy 1m07.4004s +0.3396s 54 7. Ryan Hunter-Reay Andretti/Honda 1m07.4495s +0.3887s 56 8. James Hinchcliffe Andretti/Honda 1m07.4639s +0.4031s 60 9. Juan Pablo Montoya Penske/Chevy 1m07.4764s +0.4156s 61 10. Simon Pagenaud Schmidt/Honda 1m07.5235s +0.4627s 72 11. Tony Kanaan Ganassi/Chevy 1m07.6126s +0.5518s 59 12. Jack Hawksworth Herta/Honda 1m07.6542s +0.5934s 64 13. Charlie Kimball Ganassi/Chevy 1m07.7064s +0.6456s 73 14. Sebastien Bourdais KV/Chevy 1m07.7118s +0.6510s 67 15. Marco Andretti Andretti/Honda 1m07.7942s +0.7334s 71 16. Carlos Munoz Andretti/Honda 1m07.9437s +0.8829s 79 17. Sebastian Saavedra KV/Chevy 1m07.9736s +0.9128s 50 18. Josef Newgarden Fisher/Honda 1m08.0757s +1.0149s 47 19. Graham Rahal Rahal/Honda 1m08.0833s +1.0225s 62 20. Mikhail Aleshin Schmidt/Honda 1m08.1970s +1.1362s 15 21. Mike Conway Carpenter/Chevy 1m08.2169s +1.1561s 70 22. Oriol Servia Rahal/Honda 1m08.3943s +1.3335s 51