Possible gas leak?? high gas consumption!!

Read only the white numbers, as andym said.

We only use gas for cooking – stove top/oven, and that accounts for 1/3rd of a (white) unit per day, on average. Your usage sounds a little on the high side, but I’ve heard from a plumber that although those infinity units are good in that they heat only the water that is demanded, they have to seriously blast it with heat and on the whole they’re only more efficient if you are a frugal or infrequent user of hot water. If you have kids and run a bath everyday – you’d be well better off getting a storage tank.

Next time you’re out for the whole day, or away for a weekend, take a reading as you close the door and another when you come back. Should be much the same if all is right.

If you’re not sure, take a note of the reading ahead of a time when you’re not going to be using any gas (eg. just before you leave for work in the morning), noting particularly the position of the needle on little gauge without numbers (see here: http://www.actewagl.com.au/Help-and-advice/How-to-read-your-meters.aspx), then check again when you come home before anyone uses any gas appliances. The meter shouldn’t have moved.

Make sure none of your appliances have pilot lights (most don’t these days as they use electronic ignition, if unsure, stand next to the appliance and listen for a clicking/ticking sound when it starts up).

OP said:
I understand this reading is in cubic meters

andym said :

Only read the white numbers

So…
47.312 – 43.846 = 3.466 cubic metre

Conversion: 38.6 MJ/cubic metre
Gas rate: 2.5234 cents/MJ

So, daily consumption of gas by OP = $3.37

OP’s quarterly bill will come to approximately (inc. supply fee) = $360.

Sounds a tad bit high for two adult residence.
Try shortening showers down to 10min each and see how you go.

Maybe the metres dont read 0 when they are conected. Could even be a metre that has been used previously.
I would call ACTEW and ask them the question about how to read the metre etc.
If you had a leak you should be able to smell it.
Being a new home which is most likely on a slab the gas may run through the ceiling. Pop you head into the roof space and see if you can smell anything.

I looked it up for you
http://www.agl.com.au/home/billing-and-payments/Pages/ReadyourMeter.aspx
Only read the white numbers

Crawl around under the house with a lit lighter, you will be able to find out quickly if you have a leak or not.