Thanks Charlie for the clarification.
Has the high-temperature light came up on your dash at 215 F ?
Does anyone know what engine/coolant temp will cause the "idiot-light" to come on?
I know the oil can handle quite a bit more heat, but would other engine components suffer at temps in the range of 220-250 F?
Maybe your 1.5 mph higher is from the car ageing a bit and increasing its internal efficiencies? Or improved driving skills?