Hello Annie,
Your principal objective is not to run out of gas without having refill handy to swap to.
There are a number of ways that can be managed.
You can get an automatic changeover regulator that allows you to have two gas cylinders. The gas is preferentially drawn from on cylinder until its empty , then the auto device switches to the second cylinder. Daily checks on the state of the change over valve will tell you when you need to replace the empty cylinder. This system keeps you supplied with gas continually, and gives you a quite wide window to change the empty cylinder.
YOu can also get manually operated changeover valves, but you will only know when you are out of gas on the working cylinder when the gas actually runs out.
In a similar manner you could just carry two cylinders and when the first empties, swap it for the second, and then get a full replacement ready for the next time the bottle empties.
In all these cases, if you are travelling on the continent it a seriously good idea to switch to the Camping Gaz bottles because of their wide availability.
This should only entail getting the correct pigtails fitted to your caravan, which can be swapped back to UK models when you return.
There are only two ways of determining how much gas you have left, one is to run it until none of the appliances work, - by which time its too late, or the second is use the weight method as described by Woodlands.
There are some devices on the market that claim to show how much gas you have left in the cylinders, but the effective ones are expensive and they are all no where as reliable as the weighing method.
The gas suppliers either use rather expensive volume meters, or they weigh the bottles.
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