Ganassi driver Scott Dixon set the fastest time of the final day of open testing at Sebring International Raceway on Friday with a late afternoon lap of 52.1615s (115.257mph) on the 1.67-mile, 11-turn short road course in Florida.
"We did the work on the car and as the sun went down a bit and the clouds came in, the track picked up some time," said Dixon about his final flying lap of the week. "We definitely worked to make the car better as well. I was good to do something for the lads at the end and it worked out."
Getting the fastest lap in the afternoon made up for a slightly troubled start to the day for Dixon. "We got started late because of some issues, and probably didn't get accomplished what we needed to in the first part of the day.
"We made a big suspension change at lunch time, and I actually didn't like all of that stuff, but we came out around 3pm, and didn't have time to go back on those things, so we stuck with it," he added. "We made steering changes and damper changes and seem to find a bit of a compromise for what we had."
His pre-lunch issues meant that Dario Franchitti topped the timesheets instead on Ganassi's behalf with a lap of 52.1464s (115.291mph) which he improved to 52.0157s (115.580mph) in the afternoon.
"The team always does a good job, they're very, very good," said Franchitti at the end of the day. "We're trying to learn these new cars. We're trying to learn the new car, what might break on them, where the weak spots are, how to make them go fast. Honda is learning very quickly too so we're just trying to get through all of this stuff just now."
Franchitti's testing time on Thursday was delayed while his car was fitted with Dallara's new brakes package allowing him to continue using his right foot for controlling the braking, and he was relieved that this was proving to have been worth the wait.
"I'm very happy with the two days we've had, obviously the first two days for me right foot braking," he said. "We had a lot of questions coming in to this test and we got answers to most of them, so hopefully we can put the pieces together for St. Pete and onwards."
Also delighted with the way things had gone was IndyCar's newest star, with Rubens Barrichello instantly parleying his F1 experience into strong form in the DW12 that made him the third fastest man again on Friday.