It might have what is indisputably the fastest car in the field in F1 2010, but still Red Bull Racing is 'worried' that it will 'lose out' when the world championship arrives at Spa-Francorchamps for the Belgian Grand Prix at the end of this month and Monza for the Italian Grand Prix a fortnight later.

Having dominated proceedings this season to-date - witness a commanding eleven pole positions from twelve attempts - the Adrian Newey-penned RB6 was peerless in Hungary in the last race before the annual mid-summer break, as Mark Webber produced a strategically brilliant performance to speed away to victory and with it snatch back again the world championship lead.

However, whilst the Hungaroring's narrow, tortuous layout that prioritises high downforce played perfectly to the aerodynamic strengths of the Milton Keynes-based squad's contender - thanks largely to its exhaust-blown rear end and flexible front wing - both Webber and team principal Christian Horner fear the long straights of Spa and Monza are conversely likely to expose the comparatively breathless nature of the Renault V8 in relation to the likes of Mercedes and Ferrari, whose extra horsepower could just hand them a vital edge.

"It is in the twisty second sector [at Spa] that we will have to make up time," Horner conceded in an interview with German publication Auto Motor und Sport. "Down the hill to Eau Rouge, and on the long straight and then back to the finish, we will lose out."

Webber agreed that despite having regained the advantage in both title chases in Budapest, complacency is not remotely an option for the energy drinks-backed outfit as the campaign races towards what looks set to be a thrilling conclusion.

"You get the same amount of points for all of them, but they will provide different challenges for us as a team and technically for the cars," the Australian mused of the upcoming grands prix. "We know we don't have the most powerful engine, [so] we're a little bit worried about how the long straights might go at some of the other venues and maybe Monza."