Now you've kicked the hornets nest. True or not for the majority of P&G driven vehicles yours is the first that has presented any real data. You're right about catalytic converters needing to be kept hot to reduce hydrocarbons, All you have to do is have an exhaust sensor at the tailpipe for prove the point. Kind of like when Mythbusters busted the motorcycle vs car pollution test. Things are not always what they seem. One way or the other.
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