@MIKEB: The Caparral was the original fan car, wasn't it?
The McLaren is back in action this afternoon again. Remember, the MGU-K still has its faulty seal from yesterday - a proper fix will arrive tomorrow.
Alonso is back in the pits after that quick return to the track. Ricciardo, Perez and Sainz Jr out on track at the moment
Raikkonen is back on track on the hard tyres. Ricciardo out there on mediums at the moment.
Quick update from the track for you before another Ferrari story. Hamilton is wasting no time out there and already has 17 laps under his belt. Not many green or purple times to tell you about from the last 15 minutes but Ricciardo, Raikkonen and Sainz are all out on track with the world champion.
@RayRamirez: Force India is here with the 2014 car this week. The 2015 car should make its debut next week.
Alonso sets a new PB - 1:25.961 on the soft tyres.
This looks like something of a resurgence for Red Bull with 84 laps and counting today. It's their most in a single day this year after registering just 166 in Jerez. With a time at 1:24.574 the car is no slouch either. That's faster than the best time in the in-season test here last year.
Hamilton and Ricciardo look like they're on long runs or potential race simulations out there. Hamilton's now up to 24 laps.
Hamilton lapping in the low 1:31s, which is not too dissimilar to Ricciardo's current pace. But as ever, we have no idea about fuel loads.
Alonso into nearly uncharted territory for McLaren - he's just started his SIXTH lap in a row.
@RitchieRich: I'm sorry to say I have no idea! The limiting factor would probably be the driver behind the wheel rather than current race technology. If anybody has Gran Turismo, do a quick lap in the Red Bull concept car and let us know.
@Rodster: A lot of the engineers in F1 refuse to draw conclusions in Melbourne too as it's not really a representative track for the rest of the year. Malaysia is a better test, but the conditions are still quite unusual. Teams often bat away questions until the Spanish Grand Prix back here at the Circuit de Catalunya in May - but at that point it's quite hard to convince everyone you still have a quick car despite it finishing off the podium each weekend.
@Anagh: I think we have to trust that the Ferrari engineers know better than any of us what the weak points are and how to fix them.
@Vikkstar123: Enough to race? Sure. Enough to race to the best of the car's ability in Melbourne? No.
@TPH: Rosberg did the morning session and Hamilton is out this afternoon.
@mfbull: CVC only writes cheques it is contractually obliged to write.
@CrM: Teams could run the car illegally, but a lot of work at these tests is aimed at replicating race conditions as best they can. Running a car over the fuel flow rate of 100kg/hour would make little sense ... unless you're trying to impress someone