The Red Devils have collected 33 out of a possible 42 points, and boast the league’s best away record, eclipsing title rivals Manchester City who have lost four times on their travels.
“Last season was a nightmare really in terms of our away form,” Rooney told United’s website.
“We knew we had to put that right and there’s been a real determination about us away from home this season. That’s definitely helped us get us results and win games.
“We’re pleased with that and hopefully it will continue between now and the end of the season. If we keep getting the results we want away from home we’ll have a great chance of winning the title.”
The defending champions travel to Molineux on Sunday to face an out-of-form Wolverhampton Wanderers side.
Last season, United had their early lead cancelled out by George Elokobi’s header, and Kevin Doyle scored a 40th-minute winner to sink the visitors.
But Rooney has challenged his team-mates to make amends for that defeat and move four points clear of second-placed City, who play Chelsea on Wednesday.
“It’s a massive game for us, particularly given that Manchester City don’t play until Wednesday,” Rooney added.
“We have a chance to go four points clear at the top of the table and we have to get the win. We’ve had tough games there in the last couple of seasons and we need to be at our best to win.
“Wolves are fighting for their lives after going through a bit of a sticky patch and seeing Mick McCarthy leave.
“I’m sure it’s been hard for Wolves to lift themselves, but from our point of view when you go to the home of a team fighting to survive it’s always very difficult.
“So we know we need to play well to win.”
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