Mercedes boss Ross Brawn has moved to downplay fears that F1 races next season will be overshadowed by drivers being forced to try and save fuel.

New engine rules come into force next year alongside a reduction in fuel tank size, meaning cars will have to carry lower levels of fuel than they have during recent seasons.

While the new 1.6 litre engines are set to be more efficient, concerns have been raised as to whether drivers would be forced to save fuel in races but Brawn said he felt teams would soon come to terms with the changes made.

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"From what we've done modelling and simulation I think there will be a difference between qualifying and the race," he was quoted by ESPN. "Because in qualifying you'll be controlled by the fuel flow rate and in the race you'll be controlled by the overall fuel amount.

"But I think the way that the systems are a lot more sophisticated now than they were 15 or 20 years ago when we had this situation, and therefore the drivers will be driving strongly and using all the performance.

"I don't think it will be the situation we had 20 years ago where you push for a while and then just cruise for the rest of the race; it won't be that type of racing. That's not our expectation, but there will be different demands between qualifying and the race, for sure."