[Paddlewise] Camp stove pressure question

I use a typical suitcase style camp stove when I car camp with the  
family.
http://www.amazon.com/Coleman-5430E700-Two-Burner-Propane-Stove/dp/ 
B00005OU9D

It uses a small disposable bottle of propane and each burner is rated  
at 7000 BTU IIRC. When hooked up to a small disposable bottle of  
propane and both burners are in use the pressure drops off to an  
almost useless level. When either burner is opened by itself the  
stove heats well. My question is if I use an adapter and attach this  
stove to a larger refillable bottle of propane will there be an  
increase in pressure/ fuel flow allowing me to use both burners at  
full power? If yes would the size of the refillable bottle influence  
the pressure to the stove? My eyes get kind of heavy much after PV=nRT.

Thanks for your input,

Jim et al
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