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Old 08-15-2016, 06:41 PM   #1
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Dumb question. A/C use and mileage

We have been debating this on.

I run a cat 3126b in a FL60. Does running the air con reduce diesel mileage like it does on cars ?

Inquiring minds want to know
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Old 08-15-2016, 06:51 PM   #2
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We run 2 cats in our Fiesta and I have never worried about the AC affecting mileage in 15 years and 102,000 miles. I would rather be comfortable.
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Old 08-15-2016, 07:02 PM   #3
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Not an issue...we blast it as well..for us and our dogs..

It is more of a "wonder if" question
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Old 08-15-2016, 07:13 PM   #4
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It has to reduce mpg. you are running a compressor off the engine. How much difference in mpg ? You will have to keep mpg records to find that answer.
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Old 08-15-2016, 07:35 PM   #5
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You would think...but.. the old saw says that you can pile a lot of weight on a diesel without a change of mileage..

Realistically, I would actually try this out but when you have a 100 gal tank..actually, I have 2...and they are self leveling...it is impossible to fill up to the same spot as you would in a pick up or car. I have had trouble enough trying to figure out what I am getting when we drive it..

Realistically, I would say yes.. but with all the talk about diesels and how they ignore load and keep the same mileage ..it really becomes campfire talk..

So is a compressor running a different load than weight ?
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Old 08-15-2016, 08:20 PM   #6
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My 7.5 burns about .7 gal per hour running both ACs
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Old 08-15-2016, 08:27 PM   #7
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I think I've read that with cars and modern AC, you get worse gas mileage running with the windows open than running the AC.
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Old 08-15-2016, 08:39 PM   #8
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I find that I get better mileage with the air on, cause when it's not and the windows are down, I tend to drive much faster for airflow.LOL!
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Old 09-20-2016, 07:05 AM   #9
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You have to look at the science of it.

First is the load itself, a large A/C compressor might be as high as 5hp, more likely 3hp.

Second, even though the A/C is running full-time the compressor cycles on & off as needed.

Finally, IMHO the load of the A/C compressor compared to the overall power demand required to push a huge box down the road at highway speed. Stick your hand out the window at highway speed, feel the resistance, then image that 4" X 6" hand multiplied up to 8' wide by 10' high. That's better than 2 sheets of plywood, even with slanted hoods, etc, that's still a brick relatively speaking.
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