Paul di Resta says the new Pirelli tyres generate an “incredible” amount of marbles which could make overtaking difficult.
Kovalainen hails the Lotus T128 as “much more like a Formula 1 car should be”.
Heidfeld said “I did the best I could, I didn’t do any mistakes.”
Nick Heidfeld staked his claim to a place at Renault by setting the fastest lap on the third day of testing at Jerez.
Nick Heidfeld has driven the Renault R31 for the first time as the team decide whether he will drive for them in 2011.
Adrian Sutil says the super-soft tyres is only good for one lap – and starts to go off before the end.
Sergio Perez admitted his crash during testing yesterday was his fault.
Nick Heidfeld will get his first run in the Renault at Jerez today.
In today’s round-up, Kubica hopes to return to F1 this year.