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Old 02-28-2011, 02:11 AM   #1
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which spends more gas?

I have a 11 v6 .. n I was wondering which way uses more fuel, having the a/c on or having the windows rolled down?

It's obvious the a/c creates lag or weight on the engine since the compressor is belt driven, so bigger gas consumption is natural..

But having your windows down also wastes gas cause the aerodynamics pull on the car therefore making the engine work harder to keep the car moving..

So which wastes more? Your opinions and thoughts?
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Old 02-28-2011, 08:36 AM   #2
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Didnt mythbusters prove it was the same thing?
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Old 02-28-2011, 08:39 AM   #3
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Mythbusters did this, and I do believe the car with ac on turned like 1mpg better than windows down I think. Don't quote me on this, I would have to go recheck this.
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Old 02-28-2011, 08:40 AM   #4
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I think mythbusters said that a/c lags more so the windows down saves more supposedly. I don't know by how much, though.
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Old 02-28-2011, 08:41 AM   #5
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I guess I'll have to recheck lol
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Old 02-28-2011, 08:46 AM   #6
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Quote:
Originally Posted by Lalayla
I guess I'll have to recheck lol
Like I said don't quote me on it. But I do remember it wasn't a big difference at all.
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Old 02-28-2011, 09:08 AM   #7
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Windows down at low speed and ac on at high speeds.
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Old 02-28-2011, 09:17 AM   #8
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Whatever the answer is, it doesnt make enough of a difference to worry about it.
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Old 02-28-2011, 09:49 AM   #9
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Re: which spends more gas?

I usually leave my windows down when going under say 55 then above you can run AC.. but I in general just leave the windows down and dont run the AC or heater lol
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Old 02-28-2011, 10:44 AM   #10
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Re: which spends more gas?

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Originally Posted by sno4life View Post
Whatever the answer is, it doesnt make enough of a difference to worry about it.
...and that's what the conclusion, of the "experts", is..... which I have heard before!!
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Old 02-28-2011, 10:48 AM   #11
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Re: which spends more gas?

turn the AC on half way and roll one window down, best of both worlds ha
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Old 02-28-2011, 12:38 PM   #12
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We did a study in school and the amount of gas u save or burn is not noticeable so really dose not matter.... o and we don't care bout gas mileage just how fast we get there lol
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Old 02-28-2011, 01:29 PM   #13
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Re: which spends more gas?

If you really want to save money park the mustang and buy a little 4 banger eco box. No one really buys a Mustang to save fuel, although the new v6 is doing better. Adding a vacuum gauge and monitoring you right foot will make more of a difference than monitoring the AC. Difference you see between the AC and windows down or up is way less than how you drive and where you drive. Decide what makes you more comfortable and then drive with your head and you will save fuel. Also if you really want to boost you fuel mileage, put on a set of really narrow tires that are light weight with a set of rims with wheel covers (like what the hybrid cars have). Build yourself a set of wheel well covers like they had in the 50's to cut down drag. Lighten the car of everything that doesn't make it go (AC, heater, rear seats, spare tire or kit, jack, power window motors). Then you may pick-up some reasonable fuel mileage; but is it really worth it? I know gas isn't cheep and it keeps going up, but I would prefer to be comfortable.
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Old 02-28-2011, 02:57 PM   #14
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Re: which spends more gas?

I don't care about gas mileage
I wouldn't be driving a stang if I did
Lol
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Old 02-28-2011, 04:06 PM   #15
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Re: which spends more gas?

Quote:
Originally Posted by aurelio23 View Post
I have a 11 v6 .. n I was wondering which way uses more fuel, having the a/c on or having the windows rolled down?

It's obvious the a/c creates lag or weight on the engine since the compressor is belt driven, so bigger gas consumption is natural..

But having your windows down also wastes gas cause the aerodynamics pull on the car therefore making the engine work harder to keep the car moving..

So which wastes more? Your opinions and thoughts?
i agree it works out about the same
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Old 02-28-2011, 05:45 PM   #16
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Re: which spends more gas?

Depends on the vehicle. Big V8, the a/c compressor really doesn't pull that much power. Our focus, it makes a 2-3 mpg difference having the a/c running at highway speeds. I generally have the windows down under 55, blower only, no a/c at highway speeds. If I do cut it on it's only for a few minutes and then just turn it to recirculate air.

Did this last weekend on a little road trip and averaged 33.5 mpg, not too shabby.
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Old 02-28-2011, 09:37 PM   #17
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Do whatever feels the best, you already have the best MPG mustang EVER MADE. And it's also pretty fast too
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Old 02-28-2011, 09:51 PM   #18
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K. From what I have gathered the ac becomes more efficient than windows down at 55 mph. Which means after 55 you burn more fuel with the windows down
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Old 02-28-2011, 10:01 PM   #19
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Quote:
Originally Posted by dacriss
If you really want to save money park the mustang and buy a little 4 banger eco box. No one really buys a Mustang to save fuel, although the new v6 is doing better. Adding a vacuum gauge and monitoring you right foot will make more of a difference than monitoring the AC. Difference you see between the AC and windows down or up is way less than how you drive and where you drive. Decide what makes you more comfortable and then drive with your head and you will save fuel. Also if you really want to boost you fuel mileage, put on a set of really narrow tires that are light weight with a set of rims with wheel covers (like what the hybrid cars have). Build yourself a set of wheel well covers like they had in the 50's to cut down drag. Lighten the car of everything that doesn't make it go (AC, heater, rear seats, spare tire or kit, jack, power window motors). Then you may pick-up some reasonable fuel mileage; but is it really worth it? I know gas isn't cheep and it keeps going up, but I would prefer to be comfortable.
Here here if you are pinching pennies and count mpgs then buy the 4 banger. I run my little stanger through everyday she is great. 20 mpg and I am loving it.
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Old 02-28-2011, 10:16 PM   #20
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Re: which spends more gas?

I keep mine hot in the winter actually and I keep it like a meat locker in the summer. In the winter I return about 20 mpg if I watch my right foot. In the middle of summer I return about 18.5 to 19. roughly 50/50. Best suggestion is drive more conservatively. Brush up on hypermiling. I find that on one route I take there are 2 huge hills, once I get up to the crest, I let my foot of the gas, I slow down a little below the speed limit, but I know I'll make up the difference going down the hill w/o braking.
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Old 02-28-2011, 10:40 PM   #21
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I agree with the 55 rule in general. It's just a matter of aerodynamic drag versus the power required by the compressor.
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Old 03-01-2011, 01:52 AM   #22
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I agree, I bought a mustang because I've always wanted one and i love my car, I was just wondering, but also who doesn't like saving gas when its unnecessary? Thanks for the replies, I appreciate it (:
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Old 03-01-2011, 03:09 AM   #23
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Quote:
Originally Posted by aurelio23
I agree, I bought a mustang because I've always wanted one and i love my car, I was just wondering, but also who doesn't like saving gas when its unnecessary? Thanks for the replies, I appreciate it (:
I don't mind burning gas. Top down and a/c full blast.
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Old 03-01-2011, 03:38 AM   #24
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Originally Posted by Alscobra

I don't mind burning gas. Top down and a/c full blast.
Yup.... Go buy a volt if your worried about fuel consumption.
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Old 03-01-2011, 03:45 AM   #25
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I saw an episode of top gear where they ran some little hybrid thing and a M3 around the track at the same speed. The hybrid got worse gas mileage because it was pushing harder to keep up. Just something to think about. I know the sixer and the gt are not that far off on fuel economy. Just depends how you drive.
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Old 03-01-2011, 04:32 AM   #26
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Originally Posted by Alscobra
I saw an episode of top gear where they ran some little hybrid thing and a M3 around the track at the same speed. The hybrid got worse gas mileage because it was pushing harder to keep up. Just something to think about. I know the sixer and the gt are not that far off on fuel economy. Just depends how you drive.
It requires a certain amount of fuel just to get the car moving. A 4.6 doesn't have to work as hard to attain and maintain speed. The sixxer has to work harder.
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Old 03-01-2011, 09:31 AM   #27
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Re: which spends more gas?

Just keep the Mustang 'in the driveway' -and ride a bicycle. You'll maximize your fuel economy and have 'great yard art', to boot...
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Old 03-01-2011, 09:42 AM   #28
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Quote:
Originally Posted by Camo1967Mustang
I don't care about gas mileage
I wouldn't be driving a stang if I did
Lol
+1
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Old 03-01-2011, 10:18 AM   #29
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Re: which spends more gas?

about a year ago I tried to drive to work going no faster than 55-60 and I did pick up gas mileage... but it sucked having to drive that slow
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Old 03-01-2011, 01:24 PM   #30
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Re: which spends more gas?

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Originally Posted by Everett View Post
It requires a certain amount of fuel just to get the car moving. A 4.6 doesn't have to work as hard to attain and maintain speed. The sixxer has to work harder.
You may want to re-think this statement! While it's true the 4.6 or 5.0 will not have to work as hard attain a cursing speed, thy will burn more fuel to maintain that speed (given same conditions flat or only a slight up/down hill.) This is where the ecotech engines cut out cylinders to boost fuel mileage. At speeds at around 55 it's a matter of power required to over come resistances. If you can do this with fewer cylinders, then you do not have to spend the fuel burnt in non-needed cylinders.
Then again what fun is the 55 unless you are bogged down in traffic?
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