Robin Frijns says Caterham is not running "anywhere near full performance levels" yet in testing.

While Renault-related issues appeared to affect Red Bull, Lotus and Toro Rosso on Wednesday, Caterham was able to complete 68 laps as it managed comfortably the most mileage of any of the Renault-powered teams. Frijns said the team could take great confidence from the reliability it has showed but added that he wasn't able to judge the car's potential due to running at much less than 100%.

"We've obviously made quite a lot of progress since Jerez and having finished the day with 68 laps, a lot more than the other Renault powered teams, I think everyone can be quite pleased with how this test has started," Frijns said.

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"For me it's still too early to really tell how quick the car is because we haven't yet started running anywhere near full performance levels, but overall it feels ok. I wasn't getting a lot of grip from the back end to begin with but we made a few changes to the aero balance and by the end of the session it was starting to come together, especially on the mediums which we tried in the afternoon - the grip levels on those was much better and I could really start to push on that set."

Frijns is not scheduled to drive again during pre-season testing but said he was pleased with the amount of running he managed to fit in on his final day in the car.

"That's my last day in the car before the season starts and I'm happy to finish in the car in Bahrain with that mileage completed. I'm enjoying being part of this team - they all know what they have to do to start pushing up the grid, and being part of that is good."