Newey: Harder to find gains for 2013

Adrian Newey has admitted that it is becoming more challenging to find performance gains with the 2013 Red Bull. The maturity of the regulations, which were introduced in 2009, and the lack of rules tweaks for next season mean that teams are chasing ever-shrinking improvements with their cars. The Red Bull has been the dominant force under this rules set, winning the drivers' and constructors' championship double three times in four years

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