Pirelli motorsport director Paul Hembery says the evolution of the Formula 1 cars was noticeable and he anticipates even greater improvements before the lights go out at the first Grand Prix in Melbourne.

The tyre manufacturer confirmed the test was a success and received plenty of positive feedback from a number of drivers, despite a cold and abrasive Jerez track. Hembery put the improvements down to the developments made with the new V6 Hybrid power units, after the total number of laps completed was almost doubled for the four days in Jerez compared to 12 months ago.

"The four days at Jerez were quite a straightforward test, with all the teams present getting in a lot more running than they did at this time last year: which just goes to show the phenomenal rate at which this hybrid technology has developed," Hembery said. "It's clear that the new cars have already evolved a lot since 2014, and we anticipate further improvements before we reach Melbourne in March."

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After four days of testing in Jerez a total of 2294 laps were covered whereas last year only 1470 laps were completed during the same period and with 11 teams on track instead of eight this year.

The fastest time in 2014 was 1m 23.276s by McLaren's Kevin Magnussen which was thumped by Kimi Raikkonen's 1m 20.841s in his Ferrari, underlining a huge increase in performance and reliability.

Pirelli also provided a test-only 'winter hard' prototype compound, which Hembrey explained had a faster warm-up time, and was very popular with the teams.

The majority of drivers stuck to the Medium and Hard tyre compounds at the chilly Jerez track, with Rosberg putting in a mammoth 308 laps over the two days he was in his Mercedes car. The next closet driver was his team-mate Lewis Hamilton, but he was 100 laps further down.

Overall, Hembery was satisfied with the first official F1 test of 2015 but feels Barcelona will provide his team with more representative data for the season ahead.

"We experienced varied weather conditions on a very abrasive track at Jerez and encountered no issues, with generally positive comments from the drivers," he added. "From a tyre perspective, the two tests in Barcelona later this month will be more representative, as long as the weather remains favourable."

F1 testing recommences in Barcelona on 19-22 February before a further test scheduled at the same venue for 26th February until 1st March.