United defeated Wolves 5-0 at Molineux but Ferguson still thinks that their title defence will go all the way down to the final weeks of the season.
"I expect it to go to the wire, always hope for the best and expect the worst," he told Sky Sports.
"There are only nine games left now, it is just a matter of games getting cut off one by one and hopefully we achieve what we want to achieve.
"What's significant today is its reduced the goal difference by five goals and that's down to three now and it may make a difference at the end of the season."
Ferguson was happy to come away from Wolves, where they have struggled in recent years, with the points.
"Absolutely, the last three visits we have lost twice, and that is a great turnaround for us," he said.
But despite the score-line the United boss insisted they were not at their best.
"It [performance] was okay, I don't think it was anything special," he said.
"I think as you always find here Wolves make it difficult for you, it was an okay performance.
"It's difficult for them with ten men, they were honest and committed and kept plugging away but the 3-0 advantage was too much for them."
Ferguson was delighted with the contribution of Antonio Valencia - who returned to the side on Sunday.
"The finish from Antonio Valencia for the second was fantastic," he said.
"Antonio is back in the team and his form was fantastic today.
"He's made one for Danny Welbeck before half-time that killed the match."