a different slant on saving fuel when cooking

[oldbmw]

It happens I have been researching pressure cookers, mainly with the idea of preserving meat products and ready meals. It occurred to me, many here look to save money searching for the cheapest way to cook their food. I have come to the conclusion that a small pressure cooker would save more than half the fuel needed irrespective of type of cooking stove. Put another way, you cooking fuel would last twice as long.
What do people think about carrying a little pressure cooker, as some now are no bigger than saucepans?