premise: How to avoid odometer fraud<br>Examine the odometer for the number of miles. [substeps] Automobiles average about 12 , 000 miles a year. For example, if a car is 5 years old but has far fewer than 60 , 000 miles, the odometer may have been tampered with.
hypothesis: If a car is five years old, it's odometer has been tampered with. 
reason: The passage does not say if a car that is five years old has definitely had its odometer tampered with. 