Romain Grosjean says Haas can maintain its strong start to its inaugural Formula 1 World Championship season having consolidated its fifth place in the constructors' standings ahead of the Spanish Grand Prix.

Three top ten finishes from four races for the Frenchman, including a fifth place finish at the Bahrain Grand Prix, has spurred the American team to the top five in the constructors', ahead of Toro Rosso, McLaren and Force India.

It is a result that Grosjean, himself seventh in the overall standings, says he wasn't expecting but while there have been lulls in form as the team finds its feet at new venues - such as that in China -, the Frenchman feels the team is already at a level where it can expect to maintain such lofty form.

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"If I thought about where we could be, what we can do, it's definitely better than anyone was expecting, and certainly myself. China was a good grand prix to bring us back down to earth and help us to understand a few things. Russia was good, as well.

"We worked hard to get P8 at the end. We're beyond expectations, but we'll take it. We've scored points three out of four times. Everyone is improving. There are still a lot of areas where we can be better. Everything has been a great achievement, and we should be able to keep that form."

Heading to the Circuit de Catalunya - where Haas turned its first wheel in pre-season testing - for this weekend's Spanish Grand Prix, Grosjean nonetheless admits there is probably only marginal benefits to be gained from having data.

"It's certainly going to be useful to have data from the winter testing, even though the conditions, the temperature and everything are going to be very different. The tires are different as well - we don't have the supersofts we used in the winter.

"But I think it's still going to be good. I'm not sure it's going to help us to set up the car initially, but it will help us to double-check everything we have done and to see if we've been going in the right direction since the winter testing."