Sure oil prices have fell recently, but look at the 50 years graphs and tell me which currency is more volatile, I'm not sure about the dynamics of oil pricing so I cannot comment on recent changes but over the past 50 years oil priced in gold has remained steady wheareas priced in dollars it has increased substantially since 1998 (when the money printing really got going). How can oil prices fall 30 dollars despite rapid expansion in money supply?
You seem to not understand what volatility actually means or just intentionally try to confuse matters. It is a measure of price variation of a currency over time (or any other good for that matter), not its overall appreciation or depreciation. Volatility doesn't measure the direction of price changes nor the absolute increase/decrease in prices, it shows the dispersion of prices around some mean value (e.g. standard deviation in relative terms) for a given time period...
The volatility of prices measured over 50 years just doesn't make sense (you would be tracking long term trends instead of volatility)