Hello Northernbeaches!
I know getting higher than expected gas bills can be stressful, this information should help you get this sorted.
If you have concerns there is a leak in the meter that is charging you for consumption that you are not using there are a few things that can be done to test it.
I highly recommend you run 2 tests;
Firstly, turn off your gas meter next time you leave home for a couple of house, or just will not be using the gas.
Take a photo of the meter reading before you turn it off, and then another photo a few hours later before you turn it back on.
If the meter reading increases, that means your meter may have a leak and our Resolutions Team can assist you with getting this checked.
If the meter reading does not change, I would recommend you run the second test.
Turn off all your gas appliance (hot water system pilot too if that is gas).
Leave the meter on, just don't use any gas.
Take a photo of your meter, then again a few hours later without having used any gas.
If your gas meter reading changes in that time, that indicates a possible leak in the line or appliances and you need to get a gas plumber to check it out for you.
If neither of these tests return a result showing an error, and your meter reading matches your invoice then it is likely you have more gas appliances then just your stove top causing your usage.
I hope this helps.