What happened to gasoline in the mid 1970s?

RustyRatRod said

Let me try to put it another way......hc are not MEASURABLE until combustion happens. Is that better?

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You really think gasoline is not hydrocarbons? Whether or not gasoline is detectable as hydrocarbons in emissions testing is a different question. I'd just like to know if you are really saying gasoline is not hydrocarbons.