High altitude cooking

Not a recipe so much as a cooking question. Last time I went camping, I was using a new Coleman stove with the 1lb propane bottle and it was never able to bring the pan of water to a boil. I know the altitude (about 9,000 ft) and the temperature (40 degrees) affects the heat output, but I thought I would at least be able to make coffee
How can I get more heat out of the stove? (yes, I did turn it all the way up)
Should I look for something with a higher BTU rating or ... ??? I need my coffee in the mornings!

How can I get more heat out of the stove? (yes, I did turn it all the way up)
