A logo of Mercedes-Benz is seen outside a Mercedes-Benz car dealer in Brussels By Nick Carey BRIXWORTH, England (Reuters) - Mercedes-Benz has plugged its Formula One team into the engineering process to build vastly more efficient mass-market electric vehicles (EVs), slashing development times by a quarter or more as it jump starts efforts to keep pace with Tesla. F1 technology has always eventually bled over into mass-market vehicles. But Mercedes' F1 collaboration to build more efficient EVs faster is unprecedented because it embeds that racing mindset and technological expertise directly in product development. After decades of leadership in combustion-engine technology,...