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The reason why I've become concerned about this lately is that I do quite a lot of motorway driving, something like 15000 miles per year at 120kph (75mph) and at that speed I think even a little drop in the Cd would mean some real savings especially when the gasoline is so heavily taxed and expensive round here. A liter cost around 1.45 euros and converted to US dollars that's about $8 per gallon. In other words 15000 motorway miles per year at 35mpg cost me about $3500 in gas so there's quite a bit to be gained if I manage to make this ride even a bit more aerodynamic.
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