I commute in a 190D and the other family cars are gassers so I'm buying both these days. At my local pump this morning, RUG was $3.09 and diesel 3.79. My schooling is old, but $0.70 / $3.09 = 22.65%. In my Tennessee market this ratio does vary, but I don't remember ever seeing it at just 10% although the current 22% is on the higher end of the range.

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You can't always get what you want, but if you try sometime you just might find you get what you need.