Meter reading and meter accuracy

How come I never see anyone come to read the meter?
Although you may not actually see the meter reader, we attempt to read each meter once a month. If we have difficulty accessing your meter — an unfriendly dog in the yard or locked gate with no one home — we will estimate that month’s usage. We will print “Estimated Bill” on your bill. When we get an actual read of your meter, adjustments can be made.
Could there be something wrong with the meter?
During the past 50 years, gas meters have proven to be very reliable and accurate. If, however, one shows that you’ve used a much higher or lower than normal amount of gas, we automatically take steps to investigate the problem. If needed, we will test the meter and may possibly replace it and make any necessary adjustment to your bill.