Not Ranked
I went one heat range colder on my NGK plugs from a TR6 heat range to a 7 heat range and my mileage cratered. It dropped from just over 27 mpg to essentially 25 mpg! Didn't take long to get back to the older more friendly 6 heat range plugs.
Ed
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Help them do what they would have done if they had known what they could do.
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