Yesterday's 4-1 demolition of Liverpool - thanks to goals from Hector Bellerin, Mesut Ozil, Alexis Sanchez and Olivier Giroud - moved the Gunners up to second in the table.
Wenger's side now lie within seven points of leaders Chelsea having been 14 points behind two months ago after defeat against Tottenham - their last loss in the league.
But with only seven games remaining and the Blues having a game in hand against bottom club Leicester, Wenger fears there are not enough games left for his side to overhaul Mourinho's men.
"If there was 15 (league) games to go, you would not complain," Wenger said.
"We had a very slow start this season, when we had many important players out together, and we dropped too many points.
"We played six games in the Premier League and won two, after that you have a mountain to climb.
"But now you can see that when we have everybody back, we can compete and the number of points we have made shows we have the quality to fight at the top.
"For the title we need us to be perfect and Chelsea not to be perfect, so let's focus on what we can master which means our own performance."
