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Fuel System All Fuel Discussions. MPG - Mileage - Fuel System Maintenance including Air Filter Replacement.


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  #1  
Old 02-02-2011, 07:06 PM
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Default Robbing MPG?

Just a quick question.

Is it true that leaving the A/C and Heat on in the truck steals some mpg?

Thanks

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Old 02-02-2011, 07:09 PM
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A/C yes as you have to drive the A/C compressor off your accessory drive belt and it creates resistance, requiring more power to turn the engine.
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Old 02-02-2011, 07:12 PM
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"back in the day", many would say a/c used up 1 to 2 mpg. then tests wre done and it was concluded that driving with windows down used more mpg do to drag on the car. never read a study, this all here say from "old motor heads from the sixties. i am sure turning the compressor uses a little mpg. i don't see how heat would.
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Old 02-02-2011, 07:14 PM
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Thanks so if i run the a/c it is the same as taking the compressor off?
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Old 02-02-2011, 07:33 PM
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Heat is free energy given off by the motor, no power robbed at all, UNLESS you are running the defrost mode since that will kick on the A/C compressor. A/C will rob some power as you are adding more drag to the motor by running the compressor, but in 100* heat it's worth it. Remember to turn off your A/C when you turn of your engine, it's not good to leave it on ALL the time.
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Old 02-02-2011, 08:02 PM
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In my experience, driving with the AC on does not negate fuel mileage much, if at all. It certainly does not hurt MPG enough that I think I should go without it! I like to be comfortable while I drive, and darn the circumstances of lost MPG!
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Old 02-02-2011, 11:44 PM
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i never use it in the city i always go windows down I have heard it does hurt mpg however the drag created on the highway would for sure be enough to give the same affect i would think. I always run it on the highway tho on hot days cause windows down is just too windy for this guy.
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Old 07-07-2011, 10:06 AM
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Actually Mythbusters did a test and driving with the windows down is more fuel efficient.
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Old 07-07-2011, 01:42 PM
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And who wants to do that ^^^^ on a HOT summer day???
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Old 07-07-2011, 02:49 PM
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Quote:
Originally Posted by MADDOG View Post
And who wants to do that ^^^^ on a HOT summer day???
Not me. High today 90 F with heat index of 95 F and humidity of 70% and no rain.
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