Quote:
Originally Posted by libertyfrancis1
Im curious at what point the increases fall off if you went another step colder?
I opted for 2 steps colder ngk's on my car but didnt do any real testing to have data to back up my fuel economy but was able to advance my distributor almost all the way...
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You can only go so far with a plug change as it is only one area that can have too much heat and cause knock. Lowering thermostat temp may help you get a few more degrees of timing out of it by making cylinder walls cooler... Each setup is different so test away!