Ericsson improves to a 1:24.610 on the super-softs.
@MrTuK: Honda in this case. Although reports suggest McLaren manufactured a temporary one for use this week.
@Rob: I think 300-400 laps would be ambitious with a brand new car in two and half days. But some mileage is better than no mileage at all.
Raikkonen and Sainz on track now. Kimi continues to pound round on the hards while Sainz is on mediums. Ericsson has returned to the pits after that super-soft effort.
@ankur: It depends on aero. One of the biggest reasons we don't see cars slide is not a lack of power but a lack of mechanical grip v aero grip. If fatter tyres offer more mechanical grip then, oddly, we might see drivers be able to lean on the tyres a bit more.
@Keith: That is also being considered.
@MrTuK: Halfords ran out of stock.
A dig at the Lotus/Jorda news from GP2 driver Mitch Evans
@MrTuK: That was a joke. Seriously, it's still on the table but is very unlikely to happen next year.
@Uzayr: No, Force India will debut its new car tomorrow.
The last couple of minutes of today's test. Ericsson is on mediums, Kvyat on mediums, Grosjean on softs, Kimi on hards and Sainz on mediums at the moment.
@ankur: It was just to get an idea of what they would look like, not a true test. Lotus was happy to give up a day of testing for the promotional advantages.
@MrTuK: They would need a lot more than that. Airflow, tyre flex, weight distribution are all impacted with knock-on impacts to boot.
Chequered flag. Massa finishes the day on top. Updated times and a full report to come.