The 300km completed on Friday takes the total distance covered to more than 800km over the three days.
There were no technical issues.
Tarquini was happy to sit again in a car he has not driven since last August’s test at Portimao.
"I was pleased to see that the Civic has made significant progress, which was the result of the experience gained in the three events of the past season," he said.
"On the other hand I was disappointed to find that the track had been resurfaced. I had tested a lot there with SEAT, and I counted on that experience to evaluate the performance of our car. "Unfortunately the new tarmac made impossible to make any comparison."
Tarquini and Monteiro focused on testing new parts that have been designed for the 2013 season.
“This was our priority, because we had to verify and check some parts, like the suspension, that cannot be changed once the car is homologated," he added.
"I am confident we have done a good job, especially because we had the confirmation that, following last summer’s tests, we were heading in the right direction.”
The team will test again in the second week of February at the Circuito Motorland Aragón in Spain.