Jim and Miyoko Nakano opened a donut shop on Route 66 in 1972. More than fifty years later, the strawberry donut they invented is still worth the line.Credit: The Donut ManIt's 7 a.m. on a Saturday in 2006, and I'm a bleary-eyed pre-teen coaxed out of bed by the promise of warm donuts. My dad has just clocked out of his graveyard shift nearby, and my family is headed to one of our favorite spots along Route 66: The Donut Man. The 24-hour, seven-…