Though Lewis Hamilton has expressed concern at the reliability of the W11, Mercedes once again leaves Barcelona with the highest mileage.

For though teammate Valtteri Bottas suffered an MGU-H issue in the first week and the world champion completed just 14 laps on Thursday following an oil leak, Mercedes completed 903 laps of the Circuit de Barcelona-Catalunya. By comparison, Haas completed just 649.

Though there remains a question mark over its pace, the SF1000 racked up 844 laps however, it is McLaren and Racing Point that really impress, the Woking outfit competing the third most laps (802) and the Silverstone-based team on 782.

Last year, Williams missed the first two and a half days of testing, which goes some way to explaining why the Grove outfit's mileage this year was almost 30% up on 2019, even though testing has been reduced from 8 to 6 days.

However, interestingly, Racing Point has completed 25.12% more laps than last year, which, when added to its obvious pace, must give rivals even more cause for concern.

The improvement for Williams and Racing Point will go some way to explaining why Mercedes engine mileage is up 1.68% on 2019, despite the issues that have compromised the Grove outfit and the works team this year.

In terms of drivers, Hamilton leads the way with 466 laps, ahead of Carlos Sainz (446), Charles Leclerc (442) and Sergio Perez just 1 behind on 441. Kevin Magnussen completed just 250.

Engine Manufacturer Test Mileage

Engine Manufacturer	Laps	Miles	Kms
Mercedes	2422	7005.6	11274.2
Ferrari	2228	6444.5	10371.1
Honda	1549	4480.5	7210.4
Renault	1545	4468.9	7191.8

Team Test Mileage

Team	Laps	Miles	Kms
Mercedes	903	2611.9	4203.4
Ferrari	844	2441.3	3928.7
McLaren	802	2319.8	3733.2
Racing Point	782	2261.9	3640.1
Red Bull	780	2256.2	3630.8
AlphaTauri	769	2224.3	3579.6
Renault	743	2149.1	3458.6
Williams	737	2131.8	3430.7
Alfa Romeo	735	2126.0	3421.4
Haas	649	1877.2	3021.0

Driver Test Mileage

Driver	Team	Laps	Miles	Kms
Hamilton	Mercedes	466	1347.9	2169.2
Sainz	McLaren	446	1290.1	2076.1
Leclerc	Ferrari	442	1278.5	2057.5
Perez	Racing Point	441	1275.6	2052.8
Bottas	Mercedes	437	1264.0	2034.2
Verstappen	Red Bull	414	1197.5	1927.1
Vettel	Ferrari	402	1162.8	1871.3
Grosjean	Haas	399	1154.1	1857.3
Kvyat	AlphaTauri	399	1154.1	1857.3
Russell	Williams	394	1139.6	1834.0
Ocon	Renault	376	1087.6	1750.2
Gasly	AlphaTauri	370	1070.2	1722.3
Ricciardo	Renault	367	1061.5	1708.3
Albon	Red Bull	366	1058.7	1703.7
Norris	McLaren	356	1029.7	1657.1
Latifi	Williams	343	992.1	1596.6
Stroll	Racing Point	341	986.3	1587.3
Giovinazzi	Alfa Romeo	323	934.3	1503.5
Raikkonen	Alfa Romeo	300	867.8	1396.5
Magnussen	Haas	250	723.1	1163.7
Kubica	Alfa Romeo	112	324.0	521.3