Getty Images Enlarge Related Links News: Red Bull considers engine 'alternatives' Christian Horner says Renault is still six months behind rival Mercedes and that Red Bull already has options for 2016 if it continues to fall short of expectations. Horner branded Renault's performance in Austria "unacceptable" after a disappointing debut at the Red Bull Ring, as the gap between the French manufacturer and Mercedes was brutally exposed in the Austrian mountains. Rumours in the paddock suggested Red Bull could build its own engine in 2016 but Horner says the team knows it will have a wealth of other options if it decides not to renew its deal with Renault after next season....
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