Ok. Time to unfurrow my brow! I think I'd better go back to the Buttplug thread!

 

Savage Ken you've got it backwords mate. The more humidity in the air the less oxygen per unit volume of air, and the richer the mixture becomes. The oxygen in the water stays bound to the hydrogen and remains as water. Water is a by product of combustion.
Hydrocarbon + O2 --- H2O + CO2. If you don't believe me do some research you can start here http://justkdx.dirtrider.net/printcarbtuning.html