@michaeldsouza: I imagine so, yes.
@kapa: Probably doing runs with more fuel. I always say Friday times need to be taken with a pinch of salt because the teams are always running different things - and of course, they keep these to themselves for obvious reasons.
Seeing a lot more soft tyres now. Alonso has started a lap on the medium tyre so let's see if he can beat Massa's medium tyre lap.
Unsurprisingly Alonso jumps above Massa - setting a 1:11.399.
The lap record here a 1:11.473, set by Montoya in the 2004 race. Alonso currently quicker than that which is impressive.
@RishabhBhardwaj: No. I initially wrote that it did and then my brain kicked into gear.
@satyaban: It is. Apologies, Alonso was on the soft tyre.
Barichello set a 1:10.646 in qualifying in 2004.
@ANDY: Mercedes recently reported it was tweaking the balance of his car. He didn't look completely comfortable this morning.
Rosberg has improved to P1, the new benchmark a 1:10.446.
Hamilton emerges from the pits so let's see if that tweak to his balance has done the trick.
Worth noting the pole record can only be broken in qualifying.
Hamilton's first lap puts him 0.114s off Rosberg.
Alonso complains his engine is not delivering at full power.
@Siddhesh: The re-layed surface will be a factor, for sure.
Massa beats Bottas into third by two tenths.
Only Ricciardo, Alonso and Raikkonen in the pits. Everyone else out on soft tyres as we approach the final seven minutes.
@Pronny: Possibly. The teams rarely reveal what they are doing for obvious reasons. I don't think we'll see them at the back of the field in qualifying.
Hulkenberg improves to 15th on the soft tyre.
Button puts himself sixth on the soft tyre.
Hamilton getting very irritated with a Lotus after being held up on a flying lap.
@RohanMehta: It is his engine-change penalty from Austin, which has been carried over to this race.
Magnussen puts himself 9th, so McLaren showing improvement from yesterday but still off the pace of the likes of Williams and Red Bull.
@RohanMehta: That's right. He only served a portion of that in Austin, so it carries over to this race. Earlier this year Maldonado had a grid penalty spread over three races.
@Siddhesh: They'll be doing longer runs now to work out how long their soft tyre stints can be in the race.
Massa complains on the radio about Perez and waves his fist in the air. The Force India driver pulled slowly off the racing line as the Williams approached.
"Another one!" exclaims Massa, so he's clearly feeling a bit hard done by.
Hamilton does a quickest first sector but he backs off after a wobbly middle sector.
We're into the final minute of the action here at Interlagos.
Something really off about Hamilton all weekend. Just doesn't look comfortable at all.
He will go into qualifying on the back foot, as it's Rosberg who tops his third straight session of the weekend so far.
That's all we have time for this morning. Thanks, as always, for joining me and please be sure to come back in two hours for qualifying.