Brock_from_WI
Veteran Member
[FONT='Verdana','sans-serif']I don't know how much of a difference it makes if the coolant plugs were off. I know they stay on until the coolant hits about 70F or 21C with stock settings. I am not sure how much it would affect mileage either way, when the engine is cooler it retards the timing, lowering your mpg, once warm it runs normal achieving better mileage. But then again your using more energy to heat up the coolant faster.[/FONT]