Lewis Hamilton enjoys the attention of media and fans after testing at the Circuit de Catalunya this week. Picture: AFP

BARCELONA — Triple Formula One world champion Lewis Hamilton hailed his "fantastic" Mercedes after wrapping up the first pre-season test with another 99 laps before lunchtime on Thursday.

"It’s been an incredible week of testing for us because we’ve done more mileage than we ever had before," the Briton told reporters at the Circuit de Catalunya before handing over to German teammate Nico Rosberg for the afternoon session.

"Before we came here, the team were talking about doing 800km a day and I was thinking they are crazy. I’ve never had a week like this when the car has just kept going on and on ."

Hamilton did 342 laps in total, 156 of them on the first day when the car was still fresh out of the garage. That works out at 1,592km, more than five race distances at the Spanish Grand Prix circuit.

With the V6 turbo hybrid power units now in their third year, reliability has been much better across the field than it was a year ago.

Even so, champions Mercedes have far outstripped their rivals in mileage terms, a better benchmark at this stage than outright pace because cars can have different fuel loads.

"The car looks fantastic," said Hamilton. " We don’t know the pace of the car just yet, but … it’s gone the distance and that’s half the battle."

McLaren’s Fernando Alonso, a double champion who had a nightmare 2015 due to Honda’s underperforming engine, had his spirits lifted on Wednesday when he managed 119 laps. They may have dropped again on Thursday, with the Spaniard managing only three laps in the morning and unable to set an official time due to a water leak.

"They are very, very strong," he said of Mercedes. They are stronger than ever probably."

Ferrari, closest rivals to Mercedes last year, have looked quick with Sebastian Vettel fastest in the first two days and Finnish teammate Kimi Raikkonen sounding happy enough on Wednesday.

"I am sure it’s going to be a better car than last year’s," he said. "We are happy so far even if we know there are still a lot of things to do."

The season starts as usual with the Australian Grand Prix in Melbourne on March 20.

Reuters