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Yeast CO2 discovery

Yeast CO2 seems to work a lot better of you use an unrefined sugar, eg 
treacle, malt extract, molasses or brown muscovado. The CO2 production 
continues at a slower rate for much much longer - I use a small 1l bottle, 
usually lasts 2-3 days, has now run for a week and is still going strong. 
Probably the yeast has do do more work on the unrefined sugar before it can 
metabolise it, so the process takes a little longer. Also, I can recommend 
active dried homebrewing yeast as it starts up very fast.