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#11 (permalink)

08-31-2020, 03:30 PM

eschaider

CC Member

Join Date: Feb 2006

Location: Gilroy, CA

Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor

Posts: 2,742

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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