All four wheels are powering the next step in the evolution of
the luxury-car business: the rise of all-wheel drive.  Luxury-
sedan makers are in the midst of a real scramble to outfit more
of their models with all wheel drive. Joe White has details on
The News Hub. Photo: Jaguar.  The epitome of a high-performance,
luxury sedan for many consumers has long been a car with a big
six- or eight-cylinder engine driving the rear wheels. Now, cars
that send power to all four wheels are gaining traction,
accounting for half or more of luxury-car sales in the colder
parts of the U.S. and as much as 15% of sales even in snow-free
states, up from single-digit shares in the past. Many industry
executives say all-wheel drive is now a must-have technology for
the U.S. market.    The AMC Eagle was one of the rare cars to
offer four-wheel drive 30 years ago, but the feature is becoming
a must-have for luxury-car buyers today. Chrysler  The Highway
Loss Data Institute compiled collision statistics for 10 popular
midsize luxur