Red Bull Racing's Mark Webber reckons he should probably have done better in the Belgian Grand Prix.

Webber qualified seventh for the twelfth round in the 2012 F1 World Championship, but started down in twelfth due to an unscheduled gearbox change. Despite then coming through on Sunday and finishing in sixth, the Aussie was disappointed not to be higher up, especially as team-mate, Sebastian Vettel took second.

Speaking at the finish, he blamed a lack of straight-line speed for his failure to challenge for a podium place: "The start was pretty wild, which can happen at La Source. We then settled into a race, but it became obvious quite early on that it was difficult for us to overtake," lamented the Aussie, who now drops to third in the F1 2012 drivers' standings, eight points behind his team-mate.

"Obviously Seb and I had a little battle, which was fine - but after that, it just wasn't possible to fight other people on the straight line, so that made it tough. We tried to under-cut some people and roll the dice... I had [Vitaly] Petrov on the out lap though, which is fair play to him as he's just doing his thing, but we lost time there.

"All-in-all we had a bit of luck at the start, but after that we didn't get the most out of the situation - although it was still good to finish six places higher than I started and get points."

Red Bull boss Christian Horner meanwhile explained that the reason Webber couldn't overtake was because they got the gearing wrong and this meant he spent a lot of the afternoon stuck in traffic.

"We were hoping for more with Mark but I think our selection of top gear was probably a bit short today and it penalised him a bit when he was overtaking at the top of the hill," Horner confirmed.

"But, nonetheless he's scored good points and I think in clear air he would have been very quick."