Vitaly Petrov admitted he was unsure if Mugello is 'right for today's F1 cars' after completing his single day of testing with Caterham on Wednesday.
The Russian took over from Rodolfo Gonzalez for the second day of the three-day test in Italy, working through a busy programme that included the trialling of a number of new parts in the afternoon.
Petrov ended the day tenth quickest and while he said it had been a good challenge trying to put a quick lap in, he questioned if Mugello was 'too small' for modern F1 machinery.
"I have very good memories of Mugello as this is where I won in F3000, so coming back is good,” he said. “I'm not sure the track is right for today's F1 cars - you get very close to the walls and it's maybe a bit small for the cars now, but it's still a good challenge putting together a quick lap.
“I think we can be pleased with what we have achieved here today. The car has run faultlessly all day and we have completed everything we targeted in today's runplan. This afternoon we started running some new parts and even though it's too early to make any judgements on what sort of step forward they give us, I can say the new rear wing we tried immediately felt like it was giving us more downforce. The car's balance felt better and there was more grip, so that's definitely a step in the right direction.
“Hopefully we can have a similar day tomorrow and give ourselves a good chance of making more progress when we're back racing in Spain next week."
Chief engineer Jody Egginton said he was pleased to see Petrov complete over 100 productive laps as the team worked to make up for time lost by the poor weather conditions that affect the test on Tuesday.
"Day two in Mugello has been a good one for the team,” he said. “The weather is obviously a vast improvement over yesterday and with Vitaly in the car we managed to complete 112 laps, helping us catch up with the time we lost on track yesterday with the rain. This morning we ran through a program on a variety of tyre compounds that gave us the chance to evaluate the new parts we put on the car in the afternoon.
“From that we have generated a very good amount of data the team on track and back at the factory can use to accurately assess what we have gained with the updates which include new bodywork, a new rear wing and a look at a revised exhaust layout. Tomorrow we will be looking to replicate the same sort of program with Heikki in the car and with the forecast looking good for the last day of the test we want to be able to leave Mugello having completed everything we planned."