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Right on, Neil. That's why the only way of insuring 100% nitro. is to purge all the air out of the tire. The way they do it at all the places I know of makes very little difference in the %age over regular old air.
CapriRacer, thanks for posting the reference. Good and interesting reading, Consumer Reports Study, too. The folks that serviced my tires sure didn't do it the way the Study did. I know when I first decided to try nitrogen my concerns were pressure change due to ambient temperature changes and less (hopefully) need to frequently check pressures. Where I live the ambient temps. change quite a bit from morning to afternoon/evening, and I was hoping for more pressure stability. I haven't noticed any significant change in pressure fluctuation when using nitrogen, as opposed to compressed air. Knowing this now, if my nitro. servicing wasn't free, I wouldn't do it again.
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