When detecting and recording vehicle data items corresponding to evaluation parameters for fuel-efficient driving, it is determined which one of first to N-th preliminarily-set traveling conditions a current traveling condition belongs to. The ground engaging tip includes an interior surface with a coupler pocket having an opening. The load-sensing switch would turn to the on position when the optical disk is loaded in the tray and in the rotating state. An intersecting part of the first rake surface and the second rake surface includes a protruded part located at a highest position in a region of the intersecting part along the second side surface. Detection occurs after the method for folin and ciocalteau by means of a test strip which is impregnated with the reagent, which is produced in a method wherein at least sodium, sodium molybdate and phosphoric acid is mixed and heated. Passive adapters have no components but simply wire the smaller connector to the CompactFlash connector.