Answering the call of the north, you find yourself driving up I-75 on a cool day….clear day…. dry day….during the middle of the day. No traffic tie-ups. No orange cones. Just clear sailing…. smooth sailing….it-may-never-be-this-good-again sailing. You find yourself doing a little top-of-the-head calculating. If you maintain your present pace….don't stop for gas….don't stop for coffee….and hit the traffic lights in Grayling just right, you can eclipse your personal-best time to Elk Rapids by at least 45 seconds. Maybe even a minute. Just think, three hours and 24 minutes portal to portal. 

Your present pace is a good pace, albeit a fast pace. You are clocking in at 78 miles per hour. Sure, the speed limit is 70. But everybody knows they'll give you seven over. How "everybody" seems to know…