Lewis Hamilton says Mercedes enjoyed one of its most positive days of Formula 1 pre-season testing yet as it continues to evaluate its latest aerodynamic upgrade.  The reigning world champions introduced a revised aero package for the second week of winter testing in Barcelona in a renewed push for added performance amid its own suggestion that Ferrari is currently the team to beat heading into the 2019 season.  Mercedes has been working hard to understand its new aero concept and the early signs point towards a step forward, according to five-time world champion Hamilton.  5774263478001 CrashTV:  “Today has been a good day - lots of mileage, which is great for us” said...
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