The £50million man is hitting his stride at just the right time for Chelsea's bid to make amends for their failed defence of the Champions League by being crowned champions of the world.
"I have to speak to him in Spanish so he can tell me any jokes he has," interim manager Benitez said.
"When a striker is scoring, he is happy, happy.
"I've noticed the difference in him too.
"To be fair, the team is doing really well.
"I'm not surprised because they are all training very well. You don't have anyone who is lazy.
"Everyone is trying to do the right things."
Aside from a fluke goal against Shakhtar Donetsk, Torres went two months without finding the net before last week.
Benitez added: "Everybody has been talking for months about, 'Fernando has to score more goals,' so to score four in a week, he must be pleased. That's everyone, but especially the striker."
Torres and his team-mates were today still adjusting physically and mentally to the nine-hour time difference following their arrival in Japan on Sunday, with the Club World Cup well underway.
Chelsea were last month snubbed in their bid to postpone Saturday's Premier League match at Sunderland, something that would have allowed them to set up base in Yokohama before the weekend.
The decision infuriated then manager Roberto Di Matteo, who accused the Premier League of hurting their chances of Club World Cup glory and putting his players' health at risk.
Benitez yesterday agreed with his predecessor that more should be done to give English clubs the best possible chance of success.
"When you have massive competitions, you have to give teams an advantage," Benitez said, pointing out other leagues did just that.
"When Barcelona were here, they were able to get out before we could.
"You always have to be treated in a way that shows you are representing your country.
"That is important for everyone."
Benitez was in charge of Inter Milan when they won the tournament two years ago, although that was much closer to home.
"With Inter, it was Abu Dhabi, so it was different," he said.
"But we had some time to get ready."
Other leagues have also rearranged fixtures ahead of European matches, a privilege largely denied English clubs.
However, Manchester United did win the Club World Cup four years ago - as well as going on to reach the Champions League final - with a similar schedule to that faced by Chelsea.
Benitez, whose side's Club World Cup semi-final is against Monterrey, said: "We didn't sleep too much but we are focused, we are ready and, hopefully, we will have two or three days to adapt."
Meanwhile, Chelsea midfielder Oriol Romeu is expected to be out for six months after undergoing surgery yesterday, the Premier League club have announced.
Romeu had anterior cruciate reconstruction surgery and medial meniscus repair after suffering a knee injury in the first half of Saturday's win at Sunderland.