80K on a three year old car is certainly at the top end of average mileage. However, if the car was regularly serviced it should still not be a problem. Modern car engines will usually easily exceed 100K is properly looked after. With that sort of mileage, was it a company ar? If so then many of those miles could have been done on motorways, this sort of constant speed cruising is less stressful on all mechanical parts, so is generally good news. If you keep it for three years and do 5K a year it will be down to an average of about 11K a year, which will look about right.