BEAVER CREEK, Col. — My, how the family has grown! The Audi A4 family has been Audi’s best-selling product line for the past four decades and if history means anything the new 2013 version, the eighth-generation A4, will proudly carry on the family tradition. Often referred to as the “entry-level Audi,” as if such a moniker would apply, the new A4 brings a lot to the table in the way of performance, luxury, comfort and just plain driving fun.