Four-time MotoGP champion Marc Marquez tests Toro Rosso F1 car

The Honda factory rider completed 43 laps behind the wheel of a 2012 Red Bull in Toro Rosso colours at a special test convened to promote the forthcoming F1 and MotoGP races at the Austrian circuit, before handing over to current Honda MotoGP team-mate Dani Pedrosa in the afternoon.

Marquez was watched by Red Bull motorsport advisor Helmut Marko, Red Bull owner Dietrich Mateschitz, Honda motorsport boss Masashi Yamamoto and Mercedes non-executive chairman Niki Lauda, and coached by nine-time grand prix winner and former Red Bull F1 driver Mark Webber.

Lap times were not released officially, but Autosport understands Marquez gradually worked his way down to a 1m14.9s best, and was earlier on for a lap six tenths quicker before spinning at the final corner.

Marquez's best lap was more than 10s slower than Valtteri Bottas's pole time for last year's Austrian Grand Prix, but Marquez drove a 2012 'show' car on hard Pirelli demonstration tyres with no DRS, using a V8 engine with no KERS.

He lapped just over six seconds slower than Felipe Massa's pole time for the 2014 grand prix at this circuit.

"Today, a full smile, all day! It was a great experience," Marquez said.

"It was incredible to drive a Formula 1 car, because it's my first experience with a car at a track - I [have] never driven before. I drove a Formula 3 car, but only two laps at Motegi.

"Yesterday I was very, very nervous, this morning too - difficult to sleep, even more than in a race weekend. But step by step I just tried to find a way, to enjoy it, and it was really good.

"They tell me [I was] not bad [to begin with], but I was so far [away from the pace], but then step by step I understand the things, and around these legends everything is easier.

"It is a day that will always be in my mind."

Webber said it was an "honour" to coach Marquez, who was "super-impressive" in rapidly learning the techniques needed to drive a Formula 1 car properly.

"It's impressive, because obviously Marc is at the top of his game on two wheels and to come to drive a Formula 1 car, the way we generate the lap time is just so different," Webber said.

"We have so much downforce, so much cornering grip, the lateral component, the seating position is unique because the eyeline is different.

"A super-impressive morning. He chipped away, we got into the breaking areas, we got into the high-speed corners, and now we're into this last part which takes a bit longer to get the last bit of lap time out.

"In general it's been a real honour to be here. He's driven awesome."