My scooter releases the engine below 15 MPH so I slow to 15 MPH, cut engine, ensure engine shuts off, turn engine run switch back to run position so the scoot registers the miles coasted, prepare to re-start the scoot when balance becomes difficult. Go here http://auto.howstuffworks.com/cvt2.htmto learn how CVT's work. I can explain it but this link is pretty good. The belt disengaging the engine happens below 15 MPH due to the centrifugal clutch slowing down and the clutch shoes releasing the drum.
You also need to GPS your speed and mileage to get a true reading of both...Scooters are notorious for errors of 10-15%
2006 Jeep Liberty CRD...Founder of L.O.S.T.
OME 2.25" Lift w/ Toyo Open Country HTs 235/75/16s
ASFIR Alum Eng/Tranny/Transfercase/Fuel Skids
2002 Air Box Mod...Air Tabs (5) on Roof...(3)each behind rear windows
Partial Grill Block with Custom Air Scoop and 3" Open Catback Exhaust
Lambretta UNO150cc 4 Stroke Scooter