The Finn ended the year by winning from pole in Abu Dhabi, with the fastest lap also, and emerged from this week's first pre-season test in Barcelona with more mileage under his belt than his team mate whose track time was limited by bad weather.
We could go to Melbourne now and just go for it - I just want to race! he said.
"Today has been positive, I'm so happy that I could get in the vehicle and I'm really excited that I could get some running in", Hamilton said.
Hamilton was fastest over the opening four days at Barcelona's Circuit de Catalunya with a lap of one minute 19.333 seconds on Thursday, after snow and rain blew out Wednesday's track action.
According to Hamilton, the new Mercedes W09 feels even better than the vehicle he drove to nine wins last season.
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But so far it's good. "To get a feel for the new auto and so far it is positive".
The 32-year-old believes that focussing on himself and his routine ensures that he is at his best at all times, and when that is the case, the reigning world champion feels that he will not have too many problems when he goes up against his competitors.
"I don't think I've ever driven in such cold conditions before in Formula One", he said.
The team said a broken exhaust clip had led to hot gases being blown back onto a wiring loom which included the brake wire.
"He did great in the last couple of races (of 2017) which is awesome and I'm expecting him to be in tip-top shape", noted Hamilton. "I've not even seen their livery, I just know it's red". And, again, I've only done like 50 laps today.
Belgian Stoffel Vandoorne, in the now Renault-powered McLaren after that team's split with Honda at the end of previous year, did 110 laps and was second quickest although he was using the much faster hyper-soft tyres.
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Ferrari and Red Bull are once again Mercedes' most likely challengers, but Hamilton is confident he has what it takes to beat off any of their competition.
Asked if he wanted a closer fight, he replied: Definitely. You just want to make sure the auto is running.
"The closer it is, the better it is when you win", he said.
"You want to be able to show that, and it's magnified if the cars are all the same".
The Sky Sports F1 Digital team will be providing live commentary from dawn until dusk for every day of the final test while Sky Sports News will also deliver live updates from trackside.
Gatwick Airport advice - check on your flights
A statement from Heathrow Airport says: "Extreme wintry conditions are expected across the United Kingdom and Europe today". Aer Lingus Regional cancelled its early morning flights from Cork to Bristol, Edinburgh, Southampton and Manchester.