Fernando Alonso says his main demand from McLaren Honda is reliability at the Austrian Grand Prix and that his miserable weekend in Canada is already just a bad memory.

The former F1 world champion has suffered three consecutive retirements in his McLaren MP4-30 and has only reached the chequered flag in two of the six Grand Prix he's competed in this year (Alonso missed the Australian Grand Prix with concussion).

His last three DNFs have all been due to mechanical problems and his frustrations appeared to boil over in Montreal after his 'amateur' comments over the team radio.

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Heading to the Red Bull Ring the Spaniard is hoping for a trouble-free race weekend to gain vital track mileage.

"Montreal was a difficult race for the whole team. We expected it to be tough because of the nature of the circuit, but obviously a double retirement was especially disappointing," Alonso said. "Our most important focus is reliability, so that we can get the most time on track in order to make the biggest improvements we can."

Despite the dismal start to his second stint with McLaren Alonso remains optimistic ahead of Austria and reiterated his faith in the project the team has embarked upon.

"We've already put the last race behind us and I'm keen to get out there, race hard with our nearest competitors, and hopefully have some fun."