OP
I do use 25% on deeper dives to 150 ft, but mostly because it's readily and cheaply available from topping off used tanks (700psi) of 36%. The difference is not all that great compared to air but is significant on deeper and longer deco dives.
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Da Aquamaster, I think you are right. As I said, I have 140 dives, but less than 10% below 30m. And also I never have problems at my first dive, but usually when we have 5 or 8 dives in a row. So, off course I needed to say all things in a extreme way to all people gets the point, but I would use this trick very carefully. I have nitrox trainning, but I dove only twice using EAN, because the extra cost and also because usually I don`t need it to extend my bottom time, but to avoid mosquito conservatism.