poor performance
 

newbie here. my dad owns a ts 2 mazda 6 143bhp diesel. his problem is that when traveling on the motorway and is in 5th gear at and drops to 60mph and puts his foot down the car doesnt seem to accelerate as quickly as a diesel does anyone have a idea what could be the problem as its going into mazda next week and doesnt want to be told a load of crap... cheers in advance