Reigning World Champion Lewis Hamilton reckons Mercedes is in a stronger position compared to last year, following seven days of pre-season testing in Spain.
Mercedes racked up the mileage across the opening two days of the first test, prompting the team to split each day between Hamilton and team-mate Nico Rosberg.
Hamilton finished the day down in 11th place but amassed a further 63 laps, as Mercedes enjoyed another productive day with the W07 Hybrid.
"The team has done a fantastic job with the car and we feel that we're probably in a stronger position than last year, especially after the mileage we've done," he said.
"We've still not pushed the car to the limit though, to really find how to balance it on the knife edge on the timed lap, but personally I feel comfortable right now.
"It's kind of like building a pyramid, where the single-lap performance is the very pinnacle of the whole thing.
"At the moment we are building the base with our long running during testing - and the bigger the base, the higher you can ultimately go."