2002 Regal GS - MPG indicator

[wtijr]

I have come across a 2002 Regal GS for sale. I am interested in buying it but I have some concerns. The MPG indicator always reads 22 MPG. I drove it for about 3 miles. I expected to see some change. Is this 'gauge' real-time or if not, how often does it update?

Thanks,

Bill

[Tech II]

Press the reset button while driving....mpg should go to zero, and then start recalculating mileage....This will be an average of the amount of time driving.....so naturally after a reset, it will dramatically change the average depending on the load on the engine(coasting will increase it, hard pedal will decrease it)......after being driven for a long period of time(weeks), whether you lay into it or coast, won't have much of an effect.....

22 is low, UNLESS it is because of a lot of local driving....