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This paper will establish the production quality for LNG vehicular fuel which will accommodate engine manufacturers' specifications for fuel quality at the engine. The potential degradation of the fuel from the time it leaves the production plant until it reaches the engine will be examined via a series of scenarios. The impact of engine manufacturers' fuel specifications will be translated into a vehicle fuel production specification which the consumer must utilize in selecting an acceptable fuel supplier.

This paper will establish the fuel quality necessary for use as a modern CNG and/or LNG vehicular fuel which will accommodate efficient performance and low emissions. The premise of using either BTU content and/or Wobbe index as a reliable means of fuel quality identification for vehicular fuel will be explored and discounted. Standards for transportation grade LNG will be developed.