Speed believes scoring was possible

"My engine started to let go halfway through the second stint, which is a shame because I think I had an awesome start," said Speed, who pulled out of the race with 32 laps remaining.

"I made an aggressive move on Rosberg and it paid off and I was running eleventh. So I thought maybe a point could have been possible. We'll come back strong in Monaco."

For the first time this season, neither Speed or his Toro Rosso teammate Tonio Liuzzi made it to the end of the race, the Italian being forced out with one lap remaining.

"I think it was a mistake to start the race on used tyres, as we could not match the others on pace," said Liuzzi. "The second stint was a lot better and I made up some positions after the pit stops.

"Our pace was good and the car was handling well, but on the last lap I had to stop with a hydraulic problem with the steering. It's shit to go 65 laps in a 66 lap race."