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Old 07-18-2011, 06:13 PM   #1
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Turning on the a/c

I know turning on the a/c decrease fuel economy, is it true the colder you turn the a/c, more fuel it wastes? or does not matter?

And the fans, if I switch it to 4 max setting or the circulation button, does it use more fuel as well?

Lastly, does the alternator generate more electricity through fuel burning if the battery is losing charge because I use too much cigarette lighter accessories, or turning the speakers loud?

During the summer, it's really hard to resist, I get grumpy when I am sweaty in the car.
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Old 07-18-2011, 06:32 PM   #2
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You use more fuel travelling on the highway with your windows down than up using AC. AC systems nowadays are very efficient. There is no place for sweat
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Old 07-18-2011, 07:45 PM   #3
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if the AC is on,it uses X amount of fuel,period. Now that being said, if you turn it warmer, the compressor will cycle on and off,so yes warmer saves fuel. Once it gets comfortable,turn the knob till compressor shuts off and maybe it will save some gas, I dont know how much. As hot as it is here, it doesnt get comfy till I get home, so mine is full blast all the time. 100 degrees at 70+ percent humidity sucks
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Old 07-18-2011, 08:16 PM   #4
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Yes I run my A/C for the 42 mile commute this year I am avg 41.5 mpg..I will sacrifice fuel mileage for comfort.
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Old 07-19-2011, 11:55 AM   #5
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i pulse my A/C

i generally leave it cranked for the first like 10 miles until the cabin gets cool, then i pulse it off going up hills & shit

averaging over 50+mpg my last 6 tanks
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Old 07-19-2011, 01:53 PM   #6
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Actually my average mpg is far less than you guys for some reason when my a/c is not on, a full tank of gas can run 600km(372miles) highway
In surface road, it is close to 475km(295miles)

how about you guys?

is there a problem with my engine? i never hit 40mpg
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Old 07-19-2011, 02:48 PM   #7
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Quote:
Originally Posted by caineroad View Post
Actually my average mpg is far less than you guys for some reason when my a/c is not on, a full tank of gas can run 600km(372miles) highway
In surface road, it is close to 475km(295miles)

how about you guys?

is there a problem with my engine? i never hit 40mpg
That is about how much I get; 380 miles with the last bar blinking. I think mpg depends on how you drive and the roads you take. The best I did was about 39.+ during the spring where I don't use AC and driving around 65mph.

Now I pretty much drive 65-80 with AC on and my last mpg was 34~
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Old 07-19-2011, 05:41 PM   #8
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Quote:
Originally Posted by caineroad View Post
I know turning on the a/c decrease fuel economy, is it true the colder you turn the a/c, more fuel it wastes? or does not matter?

And the fans, if I switch it to 4 max setting or the circulation button, does it use more fuel as well?

Lastly, does the alternator generate more electricity through fuel burning if the battery is losing charge because I use too much cigarette lighter accessories, or turning the speakers loud?

During the summer, it's really hard to resist, I get grumpy when I am sweaty in the car.
What's more important, a tenth of a MPG or your comfort and sanity?
Boils down to just more than .5 cents per mile for AC... BARGAIN !!!!
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Old 07-19-2011, 06:55 PM   #9
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What's more important, a tenth of a MPG or your comfort and sanity?
Boils down to just more than .5 cents per mile for AC... BARGAIN !!!!
Well... my condo management supplies 24/7 air conditioning already so i figure it is worth it to scarifies some comfort in the car and enjoy it when i get home.

anyone jealous? lol
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Old 07-20-2011, 08:00 AM   #10
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i average a little over 500miles when i fill up...& thats with usually the second bar left on the gas gauge
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Old 07-20-2011, 05:35 PM   #11
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Originally Posted by caineroad View Post
Actually my average mpg is far less than you guys for some reason when my a/c is not on, a full tank of gas can run 600km(372miles) highway
In surface road, it is close to 475km(295miles)

how about you guys?

is there a problem with my engine? i never hit 40mpg
There are too many variables to compare your mileage to others. As long as you are in the ballpark of the manufacturers rating then you're good to go.

I get from 28 to 32 mpg (winter to summer respectively) driving around town. I just did a trip from Colorado to Maryland and back under a variety of conditions and averaged 34.9 for the whole trip.

The 40+ numbers you see are operating under ideal conditions and likely using hyper mile techniques.
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Old 07-20-2011, 06:06 PM   #12
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The A/C will cycle on and off to maintain a temp range preset by the system at the condenser. It doesn't matter what you set the temperature at because the system heats the air after it's cooled. The higher you set the fan the faster it warms the condenser and the more the system has to cycle to keep cooled, so you use more fuel.
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Old 07-21-2011, 02:04 AM   #13
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Originally Posted by Bluevitz-rs View Post
The A/C will cycle on and off to maintain a temp range preset by the system at the condenser. It doesn't matter what you set the temperature at because the system heats the air after it's cooled. The higher you set the fan the faster it warms the condenser and the more the system has to cycle to keep cooled, so you use more fuel.
That's really helpful. Thanks

On the other hand, in winter you dont use the compressor for heat. Does cranking up the fan or turning the heat dial changes fuel efficiency?
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Old 07-21-2011, 06:14 AM   #14
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Turning the heat up won't change how often the system cycles but turning the fan up will.
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Old 07-21-2011, 12:07 PM   #15
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Quote:
Originally Posted by Altitude View Post
The 40+ numbers you see are operating under ideal conditions and likely using hyper mile techniques.
i literally have to BEAT THE HELL out of mine to get low 40s per tank, somewhat ideal conditions & hypermiling techniques results in low to mid 50s for me
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Old 07-21-2011, 02:15 PM   #16
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Turning the heat up won't change how often the system cycles but turning the fan up will.
How about the circulation mode vs just air in?

Thanks
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Old 07-21-2011, 05:41 PM   #17
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Quote:
Originally Posted by caineroad View Post
Actually my average mpg is far less than you guys for some reason when my a/c is not on, a full tank of gas can run 600km(372miles) highway
In surface road, it is close to 475km(295miles)

how about you guys?

is there a problem with my engine? i never hit 40mpg
I get 39-40 in the summer with the air running. It's the winter fuel blend that drops mileage 1 or 2 mpg.
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Old 07-21-2011, 11:19 PM   #18
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That's really helpful. Thanks

On the other hand, in winter you dont use the compressor for heat. Does cranking up the fan or turning the heat dial changes fuel efficiency?
Sorry didn't really read this post...

If you have the defrost on the A/C is running all the time. In the winter it will still cycle if the condenser gets warm enough.

Running the heat will only effect warm up time in the winter, which greatly effects millage. I usually don't turn the fan on until the blue light turns off and even then only on low until the car gets up to about 160°. (I have a gauge)
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