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Is there now a consensus on AC On vs Windows Down to save MPG #5428746 05/14/20 06:13 AM
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Speak2Mountain Offline OP
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on most modern cars?

Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428747 05/14/20 06:15 AM
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Bud Offline
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I would think the consensus where I live would be who cares. That AC needs to be on full time.


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Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428750 05/14/20 06:23 AM
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BMWTurboDzl Offline
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Yes,

The consensus is that one should either stop smoking or switch away from soda/beer to water l and drive with the windows up and AC on.


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

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Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428753 05/14/20 06:25 AM
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Jimzz Offline
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At higher speeds the drag from windows down actually can lose more gas mileage than the AC on uses.

Difference is minor enough do what ever makes you most comfortable though.


yup
Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428757 05/14/20 06:37 AM
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On the 3 cars I drive '97 Ford Escort wagon, '02 Ford Escort sedan, and '16 Nissan Versa sedan at speeds up to about 55 MPH it seems I usually get at least 10% better mileage with the windows down. I like the fresh air so until the temperatures get into the 90's with high humidity I usually leave the a/c off. I check mileage with every tank so I know what does and doesn't have large impacts on my mileage.

Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428767 05/14/20 06:51 AM
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Last edited by Imp4; 05/14/20 06:53 AM.
Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: BMWTurboDzl] #5428769 05/14/20 06:57 AM
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Originally Posted by BMWTurboDzl
Yes,

The consensus is that one should either stop smoking or switch away from soda/beer to water l and drive with the windows up and AC on.

I drink close to a gallon and half of water a day. But I'm still drinking my ginger ale a day.

Plus when the temp is 100F+ in April I'm using the AC.


make the inside of your engine oil cap white.
don't use.
Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Bud] #5428772 05/14/20 07:01 AM
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4WD Offline
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Originally Posted by Bud
I would think the consensus where I live would be who cares. That AC needs to be on full time.


Yep, if heat and humidity are not enough for the passengers … dust and humidity are not good for the interior …
And then there are pollens and so forth …

Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: FordMan59] #5428783 05/14/20 07:18 AM
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supton Offline
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Originally Posted by FordMan59
On the 3 cars I drive '97 Ford Escort wagon, '02 Ford Escort sedan, and '16 Nissan Versa sedan at speeds up to about 55 MPH it seems I usually get at least 10% better mileage with the windows down. I like the fresh air so until the temperatures get into the 90's with high humidity I usually leave the a/c off. I check mileage with every tank so I know what does and doesn't have large impacts on my mileage.

I can buy this. It probably varies from car to car. Model A might be 60mph, Model B might be 45.

I also wonder if interior volume matters. A car with really good aerodynmics but a really large interior space might do better with windows down to a higher speed than something with a small interior and poor aero.


2011 Toyota Camry, base, 2.5L/6MT, 205k, hers
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Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428796 05/14/20 07:36 AM
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I have to chuckle because I heard one of my friends say it was better to drive with the A/C than windows down for fuel economy when traveling at highway speeds back in 1980. Seems it would even more true today with modern A/C compressors and HVAC systems in cars. Either way, my windows are almost always up. It's quieter and calmer and cleaner.


Without data you're just another person with an opinion. W. E. Deming


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Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Leo99] #5428806 05/14/20 07:49 AM
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Chris142 Offline
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Originally Posted by Leo99
I have to chuckle because I heard one of my friends say it was better to drive with the A/C than windows down for fuel economy when traveling at highway speeds back in 1980. Seems it would even more true today with modern A/C compressors and HVAC systems in cars. Either way, my windows are almost always up. It's quieter and calmer and cleaner.

Back then those ac compressors took a lot to run. Todays compressors don't take much hp.


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Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428822 05/14/20 08:03 AM
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In a Truck, it probably doesn't matter due to horrific aerodynamics and large frontal area ( moronic style concessions to fake joe construction guy) , but on a slippery car on the interstate or rural highway over 50 MPH I would say windows up AC ON for sure.

But if you can put your windows down at low speeds it likely not that hot out.

Up here inthe North Eaast, I only use AC for cooling in the car maybe 2 or 3 times a year when it goes well over 90.

But I'm living in nice rural, treed and hilly country; not on some fake, urban, 5 lane pavement ribbon full of worthless chain stores and
stop light every 100 yards. I would mentally "loose it" if I was forced to live somewhere like that.

You know, like Naples Florida or Scottsdale AZ - in town.

What are you thinking, Town planners?

$$$$$$ Wins again - you loose.


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Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428823 05/14/20 08:03 AM
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I typically own convertibles and enjoy open air driving on non convertible cars. There is no question that on the vehicles I've owned, MPG is improved with the AC compressor off, even at high speeds.

Ford and many others often run the compressor even when you think they don't. On these vehicles, the MPG/compressor test is may be skewed by not understanding that the compressor is still on. The only way to be sure it's off is to select the climate control system completely off.


People who count on their fingers should maintain a discreet silence.
Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428829 05/14/20 08:08 AM
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The first ACs would run all the time they were switched on I believe. Add hot air to get to desired temp. (I think). New ACs cycle.

Does anyone remember the car AC kits you could buy from JC Whitney to add AC to your car? Of course without a bigger radiator they would overheat.


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Re: Is there now a consensus on AC On vs Windows Down to save MPG [Re: Speak2Mountain] #5428843 05/14/20 08:23 AM
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