"It was a pretty good day," said the Swiss driver. "It was good to run today and improve on things. We have a lot of work on the engine side, but we just need to go through the program. I'm looking forward to getting back out there tomorrow."
De Silvestro was still 7mph off the next-slowest time of the field, which on Tuesday belonged to Rubens Barrichello.
"We are still trying different things but just can't find the speed," admitted the former F1 driver. "However, what was good today was learning to run in traffic, which I haven't really been able to do much of, and working out my lines. We have another day of practice tomorrow, so we will see what it brings."
There was still no sign of Dragon Racing being able to join the fray, after their recent acrimonious split from engine suppliers Lotus left them sidelined once again. It's been provisionally scheduled that Katherine Legge will attempt to complete her mandatory Rookie Orientation Program in a special 90 minute track session first thing on Thursday morning, but this may just be notification of the last chance available to her to attempt ROP rather than a realistic expectation of the team finally having an engine for her to actually do so. There did seem to be more promising activity around the Dragon garage area on Tuesday, and there were whispers that a Chevy engine deal could be announced on Wednesday.
It was another fine day of weather for practice, which saw sunshine and blue skies that put the air temperature up to 87F mid-afternoon and the track surface measured at 126F, and a pleasant light north-northwest winds breeze.
There were a total of five cautions during the fourth afternoon of practice, for a total of 45 minutes. Two were for debris removal, and the remaining three were all for routine track inspections. There were no incidents involving car accidents or technical failures. Thirty drivers joined the line-up on Tuesday, with Lotus Fan Force United's Jean Alesi joining the Dragon duo of Legge and Sebastien Bourdais on the sidelines for the day.
Full practice 4 times