I'd like to share what I've experienced after changing my tire beliefs 8 years ago. Since that time, I've seen amazing improvements in handling, traction, hydroplaneing, tire wear, tire weight and MPG. The San Jose Police Department Training Officer has confirmed most of hypermiler's recommendations for tire pressure. At first, I was reluctant about increasing tire pressurers for all the myths I've heard during my lifetime about high tire pressure. I thought it would cause the center of the tire to wearout before the outer edges. This may have been true before steelbelted tires came out, but it is no longer a problem today.
The vehicle handles better because the tires don't ride on the sidewalls in a turn. I thought traction would be reduced because the tires were harder. It turns out with steelbelted tires, the tire patch remains flat, so the tread contact with the road is the best. I've found that it's the wear that reduces traction as the tire tread wears down. For instance, my front tires on my '11 Explorer are getting near the life of the tread, and I'm noticing some increases in slippage under hard exceleration on wet pavement and even a little on dry pavement. Because my front tires wear flat accross the tread, traction is still good in hard turns on wet pavement.
Hydroplaneing has improved because the tread is doing what it was designed to do, push the water away from the tread. Lower tire pressure increases the area of the tire patch like a larger ski on the water.
Tire wear is most important to me because of cost, handling over the life of the tire for safety, traction, and tire weight. If you can wear the tread evenly across the tire, weight decreases which decreases roll resistance. I've experimented with lighter factory rims and the same worn factory LRR tire vs a heavier factory (Limited) rim with new factory LRR tires. The difference with the lighter setup can be as much as 3 - 5 tank MPG.
Look at having higher tire pressure as the key of hypermiling. It all starts there because higher tire pressure increases the glide distance in any gear. It allows you to maintain your speed from dropping faster compared with lower tire pressure. I think Ford increased the recommented tire pressure from 35psi to 38psi on the Michelin Energy that comes with the C-Max. The Max sidewall is 51psi, so I'll most likely run 55psi on my new C-Max Energi.