Mercedes AMG PETRONAS and Lewis Hamilton finished the fourth and final day of pre-season testing behind team-mate Nico Rosberg in eighth place.
The two-time world champions split the driving duties between their two drivers, with Hamilton at the wheel of the W07 for the morning run, and the Briton completed 99 laps of the Circuit de Catalunya with a best time of 1m26.295s.
Hamilton sees the reliability of the W07 as strong and solid, like nothing he’s ever seen before.
“After Monday I was a bit sore, but I didn’t break too much of a sweat today, so that’s good,” said Hamilton. “The reliability of the car this week has been just incredible. It feels strong, it feels solid, it just keeps going and going… I’ve never seen anything like it.
“The guys and girls at Brackley and Brixworth have done an unbelievable job. After two titles in a row, it would be so easy to lose focus. But it’s clear that everyone is even more focused than before and have done an even better job of delivering an overall package with this car.”
The Brackley-based outfit have been running between 150 and 190 laps each day, the best that Hamilton has ever seen.
“In terms of today, the new front wing seems to be a step forward,” Hamilton added. “It’s small increments here and there – but that’s what we’re looking for. There’s not much of a cliff with the tyres. They behave very similarly to last year’s in that respect.
“It’s been a gruelling week for the whole team – running between 150 and 190 laps every day. But I’d say it’s probably been the best test we’ve ever had. Certainly the best I’ve ever seen.”