All-wheel drive (AWD) has come a long way from its military and off-road beginnings. Many passenger cars now have it as an option. If you live where snow can be heavy or roads are poor, it can be worth the extra money.
Traction
If one wheel slips on a rear-wheel-drive car, you're stuck. If this happens with all-wheel drive, two wheels still have traction. This gives an advantage in snowy or muddy conditions.
Stability
In severe conditions, all-wheel drive cars will tend to drive straighter. Here, other factors like traction-control systems will affect handling. Without it, even AWD cars may spin out on glare ice.
Availability
AWD is available on trucks and some passenger cars. Many luxury brands offer an all-wheel drive option. Rear drive is more widely available.
Economy
Because they have heavier, more complex drivetrains, all-wheel drive negatively affects fuel economy. Repairs can also be more expensive.
Power
AWD needs a bit more power to perform as well as rear drive, because it's heavier and less efficient. Some high-performance cars use AWD to reduce wheelspin and improve performance.
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