.???

A DD is a completely different car from Drag a little.
A DD has to have manners be nice act nice drive 12000 miles without overheating, icing, percolating the gas,burning your paycheck between filling stations,scaring the neighbors kids away,etc.Maybe it needs to survive more than one driver.It has to be a car your wife will actually ride along with you in.Maybe you'll take it on vacation,thru Nevada, or over the mountains. Or pull a soft-top. A DD is a special car.