Ross Brawn is confident next year's Championship will not descend into a fuel efficiency war.
As of next season, not only will Formula One switch to 1.6-litre turbocharged V6 engines but teams will also be limited to 100kgs of fuel.
That is believed to around 60kgs less than what they currently use sparking fears next year's races could be won or lost on fuel save.
Brawn, though, insists that won't happen.
"From what we've done modeling and simulation I think there will be a difference between qualifying and the race," the Merc team boss told ESPNF1. "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." Planet F1