Estimated time drivers save by using real-time GPS traffic updates
Drivers that use GPS systems with real-time traffic info spend 18% less time behind the wheel than those who do not.
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I half agree with you. Settings by one person will not necessarily work for another.
However, the outrageous cost for "professional" calibration is just that....outrageous.
How will Geek Squad ever continue to sell their $300 calibration plan?!?!