Very few companies can look deep into brand loyalty and find that one of the key differentiators is its employees, especially the ones who wear roller skates. However, that’s exactly what the Oklahoma City-based SONIC Drive-In finds. In the highly competitive, increasingly crowded world of fast food, small details can make the difference between a customer pulling into your restaurant and the one next door. Customer loyalty runs deeper than wheeled servers at SONIC, though. Loyalty360....