{HEAD ~ This invention} relates to techniques used for controlling fugitive gases used as a supplemental fuel source for an engine and, more particularly, to {TAIL ~ techniques} used to control engine speed when the supply of fugitive gases varies in composition and flow and where the engine may be other than an ordinary aspirated engine 
relates to
{ HEAD ~ This invention } relates to techniques used for controlling fugitive gases used as a supplemental fuel source for an engine and , more particularly , to { TAIL ~ techniques } used to control engine speed when the supply of fugitive gases varies in composition and flow and where the engine may be other than an ordinary aspirated engine
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