 While a skilled racing driver, Mulholland was more infamously known as Bruce McPhee's 'contractual obligation' co-driver.In endurance production touring cars McPhee raced in during the 1960s which required two drivers, Mulholland would drive one lap at approximate mid-distance before handing the car back to McPhee.Mulholland holds the record for fewest completed laps to win a Bathurst 500 when he co-drove with McPhee to win the 1968 Bathurst 500.