Four times Formula One world champion Sebastian Vettel considered quitting as he struggled with the sport's new direction last year, according to the German's former Red Bull boss Christian Horner. "Seb didn't enjoy the regulation changes," Horner told British reporters ahead of this weekend's first pre-season test in Jerez, Spain. "He didn't enjoy the new engine, the feel from the new system, the power unit, the brake by wire, the lack of downforce. You could tell he wasn't happy. "He was preoccupied and to compound that his teammate (Australian Daniel Ricciardo) won three races. There was that feeling 'Am I enjoying this as much as I thought I was?'" While...
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