The United marksman has been in scintillating form this term and currently tops the league's scoring chart alongside Didier Drogba with 26 goals so far.
Ten of those goals have come with his head and the England ace went on an amazing hot streak which saw him hit 19 goals in 15 games before picking up an ankle injury against Bayern Munich in March.
Rooney admits the departures of Cristiano Ronaldo to Real Madrid and Carlos Tevez to Manchester City have given him the chance to play more centrally, but knows his good form will count for little if the Red Devils do not pip Chelsea to the post.
"This has been my best season. I have scored a lot of goals and my overall play has been good," he said in the Daily Express.
"It has definitely been my most prolific season and I'm pleased with the way things have gone.
"But it would complete it all if we could clinch the title. We are still in with a chance. We have to win our match against Stoke and then if Wigan can do us a favour that would be great.
"We can't do anything else than win our game and hope. Let's see what happens on Sunday.
"Losing Cristiano Ronaldo and Carlos Tevez took a lot of goals away from the team. I knew I'd have to score more.
"It has also meant that I have played up front all season and that has made a big difference to my game.
"It was a big loss but we still have good players here. We just knew that we had to work hard and find a new way of playing.
"We have managed to do that. There have been ups and downs along the way, but we've done well."
United need Wigan to stop Chelsea winning at Stamford Bridge if they are going to stand a chance of reaching the summit on the final day of the season.
But Rooney has issued a formidable warning that whatever happens he will improve next year and come back an even stronger player.
"I want to improve on all aspects of my game - scoring and creating goals," he added in the club's official magazine.
"That's why I stay behind every day to practise."