No use to you now....
How can i get better on air?
Fortunately there is lots of ways to improve, but they all take dedication… something most people don’t seem to like.
1. Dive More
This is a fairly self evident tip, however before you dismiss me as the master of the obvious, I need to say that this really is the only way to develop and hone the skills in the rest of this post.
The professionals who dive all the time have the advantage as they are more comfortable in the water. They are relaxed and streamlined and have figured out the most efficient way for them to dive. Even though you may have 200 dives, if they are spread out then you are more than likely going to suffer on the first couple back. Even people who have 1000′s of dives remark that it is a perishable skill if you are out of the water for a long time.
2. Breath Deeply and Slowly
Slow in, slow out. No holding your breath. Try and slow down, relax
This is definitely hard to do at first, especially if you haven’t dived in a while. Your wetsuit doesn’t fit like it used to, your gear seems like it’s all wrong, it’s cold and you are annoyed because it wasn’t like this last time you dived.
A week in the Solomon Islands will fix that 
3. Streamline your Gear
I’m sure we are all guilty of this one at some point. But make the extra effort in getting efficiencies by streamlining your gear. Get it neutrally buoyant, and setup so you are naturally comfortable in the horizontal position. Moving horizontally through the water creates less resistance. Cut away all those accessories you never use, it will reduce drag. Drag is a significant factor in the effort needed to propel you through the water.
Ensure there are no leaks from any of your o-rings and make sure your regulators are maintained. A big effort here will pay massive dividends in the water, with more comfort and reduced stress.
4. Stay higher and Slow down
Stay shallower, if you are just getting in, or back in to the water. This will increase your dive time as well as allowing you to probably see more life. Even if you choose to stay a little bit higher than the group, this minor change over time will conserve air.
Also, just take your time and go slow, trying to see everything will mean you see nothing well, in the process you will piss off your buddy, and waste air.
5. Buoyancy and Position
Having neutral buoyancy throughout your dive will make a huge difference.You should start with your gear and your breathing.
Your aim should be to create a balanced equipment setup so you can comfortably maintain you position in the water at around 5m with a nearly empty tank. If you over-weighted you will need more gas in your BCD this increases surface resistance, and you will use more energy while pushing yourself through the water. The same goes for under-weighted, you might be fine at the start of the dive, but as time goes on you will need to kick yourself back down. Wasting energy and gas.
Your breathing can make small adjustments while moving, use this to your advantage and don’t rely on your BCD. Keep your hands in and comfortable, you should be able to move through the water without the use of your hands. Try and maintain a horizontal profile, this will create less resistance.
6. Get Fit
Yes that bit of extra chub is affecting your air consumption. Combine that with the fact that you haven’t done any exercise in 6 months and you are really using air.
The fact is, fitter people can use their bodies to do weird stuff like diving more efficiently, their muscles use less energy doing exercise and hence require less air.
Also fitter people have an enhanced ability to handle stress, which comes in handy when a bad situation sneaks up on you.
The wrap up
You need to dive more to get comfortable and relaxed, training will help, but logged dives are essential. Paying a lot of attention to your equipment will reap huge rewards in the water. Get yourself in shape, it will improve your diving as well as make you look better naked 
Happy diving,
Chris
Air consumption, Diving Sunshine Coast, Diving Tips, Reduce air consumption