"We've had a very good day completing 151 laps with Lewis without any real issues on the car," Explained Trackside Engineering Director, Andrew Shovlin.
"We had a good baseline to work with from the test, so our focus has been further understanding the car and tyres.
"We had a comprehensive aero data collection programme which we got through whilst the track was cold first thing, then got stuck into proper running for the remainder of the day.
"It's difficult on a race weekend to complete proper tests due to the limited number of tyres, the constantly evolving track and the requirement to get the maximum speed out of the car.
"Here we were able to step through a large programme of setup items, so Lewis has been able to get a good feel for the effect of these changes and hopefully that will help us get the most out of the car at the upcoming races. We've got Valtteri in the car tomorrow and another very busy day planned."