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Old 09-16-2017, 10:08 PM   #1
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Default AC uses a lot of Gas?

Hi, where I am living is really hot in summer. I usually turn on the maximum AC when I drive, which is "4". I don't know why I find the gas bars (meters) drops fast. For example, let's say one bar can let me drive 25 -30 miles, but now only half distance like ~15 or even less. I don't know if this is normal? Anyone has the same problem as mine? Or I need find a someone to look at my AC.
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Old 09-16-2017, 10:48 PM   #2
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Can't measure it like that. Gotta average your actual mileage based on fill ups and miles driven.

Yes the a/c makes a big difference in this car. The engine is small and has to work harder to turn the compressor, so you notice it.
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Old 09-16-2017, 11:40 PM   #3
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As long as I stay in the 30mpg range Im happy. I sold my 1992 Metro which got 50mpg. So its a hard adjustment.
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Old 09-17-2017, 01:17 AM   #4
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The AC just kills the performance and economy of my 1.4 manual hatch. I even momentarily shut the compressor off when starting from a stop, so as not to slip the clutch because of the power sapping compressor.
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Old 09-17-2017, 09:39 PM   #5
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Originally Posted by Papasonic View Post
The AC just kills the performance and economy of my 1.4 manual hatch. I even momentarily shut the compressor off when starting from a stop, so as not to slip the clutch because of the power sapping compressor.
How about Gas? Do you use a lot of gas if you turn the AC on? "The compressor" you mean the AC compressor? I haven't notice any problems about AC affecting engine or car performance. I drive automatic car, but I feel AC is a gas eater.

My friend drives a large SUV, but I don't think her AC uses a lot of gas.
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Old 09-17-2017, 10:26 PM   #6
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Quote:
Originally Posted by sdpapet View Post
How about Gas? Do you use a lot of gas if you turn the AC on? "The compressor" you mean the AC compressor? I haven't notice any problems about AC affecting engine or car performance. I drive automatic car, but I feel AC is a gas eater.

My friend drives a large SUV, but I don't think her AC uses a lot of gas.
Yes, gas mileage on any vehicle with a small displacement engine will suffer when using the AC. Also wind and hilly conditions are detrimental to fuel economy. A larger vehicle with a V8 engine isn't affected as much by using the AC, as horsepower and torque are in abundance. Small vehicles with small engines have wildly varying fuel economy, depending on operating conditions. On my Silverado and GTO; I don't notice the fuel mileage vary significantly using the AC, nor do I feel much performance difference.
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Old 09-18-2017, 09:39 PM   #7
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A/C usually consumes ~3 horsepower from an engine. Possibly a little more when it's first started until the system pressurizes.
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Old 09-20-2017, 03:50 PM   #8
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A/C usually consumes ~3 horsepower from an engine. Possibly a little more when it's first started until the system pressurizes.
Oh, the total horse power of my car is around 140. Hmm, it shouldn't use so much gas.
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Old 09-20-2017, 10:56 PM   #9
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Quote:
Originally Posted by sdpapet View Post
Oh, the total horse power of my car is around 140. Hmm, it shouldn't use so much gas.
Your engine isn't producing 140 HP all the time. That's it's maximum output

The following is an example only. Actual numbers will probably vary:
Your engine might only need to produce 20 HP to maintain a speed of 30 mph. That 3 HP drain now requires the engine to produce 23 HP to keep going that same speed.

That's a 15% increase in power demand, creating the same increase in fuel consumption.
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Old 09-21-2017, 04:50 AM   #10
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With our lil motors the ac really does kill it, I run mine almost all the time and I'm in the mid 25's mpg, if I turn it off it will jump almost 3 to 7 mpg city easy... it's not a efficient ac unit.

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