When the previous-generation Audi Allroad replaced the A4 Avant in the U.S. model range for the 2013 model year, sales increased by 50 percent. Yes, hard-core Audi aficionados went ballistic about the lack of a regular A4 wagon—or A4 Avant in Audi-speak—but understand that a regular station wagon isn’t what the American car-buying public purchases. While many people, including us, would prefer the lower, sportier wagon it offers in Europe, Audi is also in the business of selling vehicles and making profit. So, when the newest, B9-generation A4 range launched earlier . . .