Fernando Alonso has warned title rival Michael Schumacher he will not let up in his quest for a second world championship, despite boasting an imposing advantage heading into Sunday's race.

The Enstone-based Renault F1 team driver, who lives in Oxford, leads Schumacher by 23 points approaching the midway point of the season at Montreal, but he has vowed not to ease off in Canada.

The Spaniard made a rare mistake 12 months ago when he hit a wall in Montreal to lose what looked like a certain victory, allowing title challenger Kimi Raikkonen to move back into contention.

He is determined to avoid giving Ferrari rival Schumacher that kind of encouragement this weekend, promising to push to the limit to keep the great German at bay.

He said: "The season is not even at the halfway stage yet and, in Ferrari, we have very strong competition.

"Last year, we were fighting against teams who had reliability problems but that won't happen with Ferrari. They will be there at every race, and very strong in Canada as well.

"So we are still attacking, still being aggressive, putting new parts on the car and trying to push the limits at every race. That's the only approach we can afford to take this season."

Montreal is a venue Alonso has been looking forward to all season as he aims to right the wrongs of previous seasons and finally stand on the podium there.

He arrives on the back of three consecutive victories five out of eight races this season and sees no reason for Renault's crushing dominance to wane on the Ile de Notre Dame.

"Canada was one of the races on my to-do list at the start of the season," he added.

"I have never finished on the podium there, and that was one of my goals for 2006. So I will be really pushing to get a strong result there."