OMG! High miles!
If a mile is 63,360 inches and you take the minimum 9" BBC that's 7,040 strokes! If he averages 60 strokes per minute, that's about a half a mile of cock per hour!
If you figure an average of a half hour of steady fucking or a quarter mile of dick each time you get laid, just estimate how many times you have fucked, divide that by 4 and you will have an idea of what the total mileage of cock wear and tear on your cunt is!
Of course, all of the variables such as different size cocks, duration of fucking, etc. will all give new meaning to "Your Mileage May Vary"!