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Cold air takes more effort to move it out of the way. Use of the heater takes GAS to keep the water warm. In my experience warm air intakes help if you drive is like 10 miles or less, hurts if its more. It can cause your computer to reduce timing, increase the afr to reduce or prevent detonation, knock, etc. The second problem is the gas stations move to a winter blend which gives less mpg. Sounds like you know its just the air temp currently. You know, I have a block heater, but I cant measure any changes in mpg using it with my drives.
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