London, England - Lewis Hamilton can become Britain's first four-times Formula One world champion this season, but some former racers fear the Mercedes driver's celebrity lifestyle could make the task harder.
The 31-year-old, who has risen from an underprivileged background to global superstardom, spends much of his down time in the United States with Hollywood and music A-listers.
From Super Bowl with Jay Z, to Hollywood parties and New York fashion shows, he is living a life that few of the current crop of drivers have access to or are up for.
Not me that needs to change: Lewis
German team-mate Nico Rosberg, rival and championship runner-up for the past two seasons but winner of 2015's final three races, is more likely to stay home with his wife and baby daughter.
Ferrari's four-times world champion Sebastian Vettel, a father of two who is likely to be Mercedes' biggest threat in 2016, lives in Switzerland where he keeps his family out of the public eye.
Both are fully focused on beating the Briton.
Former racer turned television pundit David Coulthard said: “It seems crazy to question whether Lewis can win another title, given that he's won the past two - but you have to ask where his energy is going...
“There’s no question that Lewis is fit and focused when he's at the racetrack. But he does have a full-on social life away from grand prix racing. We all know it's not easy jumping on and off aircraft. Is this the year that's going to take it's toll?”
That may be wishful thinking from somebody who still represents Red Bull, the dominant team before Mercedes, but Coulthard is not alone in expressing concern.
When Hamilton was at McLaren, where he won his first championship in 2008, he was kept on a tight leash but since he joined Mercedes in 2013 he has been allowed to be himself.
He now has more money than he knows what to do with, a collection of supercars, a house in Colorado, an apartment in Monte Carlo and a bright red private jet.
He has gone skiing with US Olympic champion Lindsey Vonn and been filmed driving Justin Bieber around Beverley Hills in a LaFerrari supercar.
SOMEWHERE ELSE
Another former racer, Sky television commentator Martin Brundle, said: “I feel I know him less today than I knew him 15 years ago. He's moved on to a new level and I don't say that in any way as a criticism.
“The Lewis I knew as a racer has moved into a whole sphere of life that I don't have access to, don't know and don't understand. He seems like he's gone somewhere else, to me.”
After completing huge amounts of mileage in the first pre-season test in Barcelona on the Thursday, Hamilton flew to Los Angeles for an Oscars party before testing resumed on Tuesday.
As his 2.5 million followers on Instagram were well aware, he then went to Paris where he was photographed with ex-Beatle Paul McCartney at Stella McCartney's fashion show. On Saturday, he was at Vivienne Westwood's.
If some traditionalists would rather he spent more time in the factory talking to engineers, which he also does, F1 supremo Bernie Ecclestone is delighted and the man himself sees no need to change anything.
Hamilton, who also spends many hours making music in the recording studio, told the official formula1.com website last month.
“I try to find a balance in my life. Sure, you need to be recharged and have full batteries for the season. And yes, the lifestyle that I live is definitely different to the other drivers. But who says that it has to be the way they are doing things?
“My style works perfectly for me. It's all about enjoying every moment and doing my job in the best way I can.”
Brundle echoed Coulthard's comments but felt sure Hamilton's relentless desire to win was as strong as ever.
Mercedes has won 32 of the past 38 Grands Prix and Hamilton accounts for 21 of them - 10 in 2015 and 11 in 2014. A drop off in form at the end of last season came only after he had clinched his third championship in Texas.
Brundle said of those last three races: “I believe he gave Rosberg a confidence and a self-belief that he didn't ought to be letting him have.
“But I think that street-fighting Lewis will be a greater opposition in Australia than he was at the end of last year when he relaxed because the championship was in his pocket.”