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Travis from MWOD staff here. To continue off what Phil suggested, using a softer grippy ball across the heel and up and down the sides of the shin and calf to relieve any tension in the soft tissues should be helpful. Think about getting some balls from Jill Miller at Yoga Tune Up, they are very good for the feet. I would also pay attention to your foot position while you drive. I like to tell people if you walk with your feet straight ahead, you should try to drive with your foot straight over the pedal as well. We all tend to adopt the duck foot position when we drive. See if this helps next time you have to travel a lot.