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post #1 of (permalink) Old 12-04-1999, 08:29 PM
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mileage going down?

My 90 FS Bronco used to read about 115-125mi. at one half a tank. Lately, I only get 90-100 per half tank. Does having the heat on low reduce MPG that much? Is there anything else that I should look at?

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post #2 of (permalink) Old 12-04-1999, 10:40 PM
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Re: mileage going down?

I don't know if you had this vehicle last winter or not, to compare what effect cold weather has on your mileage. Winter in a cold climate definitely reduces gas mileage, and it will be most dramatic if you go relatively few miles per trip. Then the warm-up interval is a significant portion of your total trip. The mileage in the warm-up interval is poor. The heater itself really doesn't have any real effect on mileage (yeah, it probably slows warm-up a bit, but not significantly).
In the South, gas mileage is the best in the long spring-like and fall-like seasons, dipping a bit in summer due to the A/C compressor load, but dropping the most in the heart of what winter there is (but warms up a lot faster than up North!).
On the other hand, if you've had this vehicle for years, and this drop is unusual, you're the best judge of that. Then maybe something needs attention.

post #3 of (permalink) Old 12-04-1999, 11:59 PM
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Re: mileage going down?

>>>>Hey, don't forget that Ford built a circuit into the heater controls that activates the AC compressor during the winter to prevent it from freezing up. The circuit only interacts when the selector is in one of the defrost modes. In the "floor" position it does not run. There is a pair of wires that go into one plug on top of the compressor. If this is unplugged it will not function, don't forget to plug it in next summer. This may not be the problem, but, may get you a few miles back since it is the same load as when the AC is on, even if only intermitantly. Hope this helps ya. Laters.

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