Re: AC and Gas Mileage

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Re: AC and Gas Mileage

Bubba

31 Jul 2005 21:54

>This is what confuses me about the discussion of AC relating to fuel
>economy. I have a 93 Honda Accord & I can feel when the compressor
[quoted text clipped - 3 lines]
>disengaged even with the AC "on".
>Thanks for your input.

On the V8 engines a "properly operating" air conditioner will cause about
a 1 to 1½ mpg impact in fuel economy in around town driving, slightly less
with sustained driving at highway speeds. The operative phrase here being
"properly operating".

Rich

31 Jul 2005 21:25

> The compressor run time is determined by the evaporator outlet
> temperature. As long as the evaporator temperature is above 33F. the
> compressor will run. Regardless of the setting.

This is what confuses me about the discussion of AC relating to fuel
economy. I have a 93 Honda Accord & I can feel when the compressor
clutch engages & disengages. When it engages I can feel the engine is
under more load(more vibration at stop or slight drop in acceleration or
speed in motion). Surely fuel economy increases when the compressor is
disengaged even with the AC "on".
Thanks for your input.
Rich

TomP

31 Jul 2005 14:22

> I have an 05 Accord
>
> Is the amount of gas used by the AC proportional to the temperature
> setting?

As it would relate to compressor run time, yes.

> I was thinking that the lower the temperature the more often
> the compressor would have to come on. Is this accurate?

The compressor run time is determined by the evaporator outlet
temperature. As long as the evaporator temperature is above 33F. the
compressor will run. Regardless of the setting.

Best fuel economy can be had by driving with ac off and windows
up. Any time the ac is on, it costs gas, and is proportional to
compressor on time. So the question is: how much do you like to sweat?

> thanks,
> -Mark

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MF	24 Jul 2005 16:47
I have an 05 Accord Is the amount of gas used by the AC proportional to the temperature setting? I was thinking that the lower the temperature the more often the compressor would have to come on. Is this accurate? thanks, -Mark

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