Method for determining the performance of a motor vehicle consumable, including engine lubricant, fuel and tires in a motor vehicle having an engine with at least one fuel injection valve, a lubricating system and a CANbus network having at least three network nodes, each operably connected to a computer. The booth is sized and shaped to enclose a person having a first side wall and a second side wall, the booth having an open portion sized and shaped for ingress and egress by a person. The speed and location information is stored in a cache. A output is obliquely angled away from the face and optically couples the reflected optical radiation away from the face. Structures that are substantially below that certain height can be protected from contamination and left intact.