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Here in Fresno (which is cold in winter (30's) and very hot in the summer (100's)), I barely need it in the summer but this winter I have the lever all the way up for about a minute and then I slowly lower it during warmup to keep the rpms around 1800. I almost never drive with it up as it keeps the rpms too high.
My car is not in perfect tune but it will be in about a month.
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