Sebastian Vettel took aim at Max Verstappen after the Red Bull driver suggested Ferrari's recent speed advantage has been gained by cheating. Ferrari endured a struggle at the United States GP, Vettel retiring early in the race and Charles Leclerc struggling to keep pace with the top three, using an old spec power unit. Article continues under video The performance came after a week in which the FIA had issued a Technical Directive to teams – prompted by a fuel flow proposal from Red Bull which was ruled illegal and seen as an attempt to get to the bottom of Ferrari's greater power. In response to Ferrari's disappointing form in Austin, Verstappen said: "That's what happens when you...
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