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AWD vs 4WD - What's The Difference?

What's the difference between AWD and 4WD? I was handed the keys to the brand new BMW M5, which can actually switch between 4WD and 2WD! Nothing all that impressive for any truck drivers out there, ...
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AWD vs 4WD - What's the difference?

What Are The Differences Between AWD & 4WD? Which Is Better? What's the difference between AWD and 4WD? I was handed the keys ...