The 31-year-old striker moved to his boyhood club on a free transfer over the summer window which ended his 13 year spell at Old Trafford.
In contrast, the entire Everton team have scored only seven times in nine matches.
Lukaku's six goals in his first six matches suggest that even the £75m United paid Everton may prove to be a bargain.
He's coached and won League titles in Spain, Italy and Portugal but Manchester United manager Jose Mourinho believes it has never been more hard to win the Premier League title despite being a three-time victor with Chelsea.
Asked about landing Lukaku, Mourinho said: ' I don't think it was my influence, no.
"It was a Premier League where it was easier to score goals, not just because of the difference between the top teams and others but also because of the profile and the tactical interpretation of the competition".
"I think it is more hard now", he said.
"So it's not just the striker. United will find a way through, while I don't think Everton will", he added. "Romelu's team plays different football and the confidence levels are different and it is a team in the second year of its evolution in some aspects".
"And I think the stadium will show him that respect that he deserves, I hope before the match and after the match, not during the match". "We couldn't be happier".
He said: "I am not going to compare".
"It looks to me that everything around him is very normal". When players are similar, you can compare.