When someone asks you about your game the answer you give may well depend on who is asking, why the are asking and when they are asking.
Many golfers have a tendency to either exaggerate of downplay their abilities depending on the circumstance.
On the first tee trying to negotiate strokes, golfers tend to downplay their abilities. If asked at a social function how far you hit your driver and you realize it is highly unlikely that you will ever have to back up your statement you may say ‘oh, around 260- 280’. The thing is you may have once hit a drive 280, with a 30 mile an hour favoring wind on a dry course with fairways like a parking lot but is that anywhere close to your average.
According to Trackman, at sea level, with no wind and under PGA Tour conditions using a Tour quality ball you need a swing speed of around 105 MPH to hit the ball in the 260-280 Range. And that presumes you are hitting on the center of the club face with the optimum launch angel and spin rate.
The chart below provides and indication as to what to expect in terms of distance based on club-head speed.