Driver: Felipe MassaChassis / Engine: FW37-01 / PU106B HybridLocation: Jerez de la Frontera 4.428kmObjectives: Aero work, systems and reliability checksWeather: Mild and dryAir & track temps: 9 - 14ºC / 8 - 16ºCRod Nelson, Chief Test & Support Engineer: Today was another trouble-free day and so we completed our programme for the week. Today’s focus was on aero and mechanical set-up, as well as working through systems reliability. We have highlighted areas we need to improve before Barcelona and leave here with a reliable package that is straight forward to work with. I think we are all very happy.Felipe Massa: The FW37 once again proved how reliable it was with an error free day. The car has been consistent over the last four days and we have made good progress. We have highlighted certain areas that need work and so will make sure the car is improving every time we take to the track. We have our feet on the ground and are focused on making this car quicker when testing continues in Barcelona.