I live in an apartment building & noticed there are 2 gas meter numbers on my bill. Is this normal & can I know why there are 2 meter numbers.My most recent bill has gone up drastically. There are only 2 people in my unit & compared to my sister which is a household of 4 (stand alone house) it is way higher. I am not sure how this could be.Can you please shed some light on the above questions. Thank you.