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Old 01-24-2008, 08:56 PM   #11
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Do you mean higher octane when you said higher grade? Higher grade gas might give you slightly better mileage, higher octane will not. Poorer mileage in winter is due mostly to the winter blend (more ethanol) of gas. In very slippery conditions, tire rotation with lack of traction can have a mior affect also. As for the colder therfore denser air, I believe the computer adjusts the injectors for that. Cold also affects tire pressure. It'll be less in cold weather and less pressure in tires also has a very minor affect on mileage. Of all the above, the winter blend gas is the biggest culprit. Driving habits affect mileage more than all the others listed above.
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Old 01-24-2008, 08:56 PM   #12
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technically no, but it steals power. so if you want to go the same performance, you will give it more gas, and therefore get worse mileage (i think)

but i have gone 160 miles and im at half tank.
that'* with 20-30 minutes of idling every day
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Old 01-24-2008, 09:00 PM   #13
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its been proven to.(i like to watch mythbusters). 2 SUVs were tested one with the Air Conditioner on the other with it off and the windows down and the truck without the A/C on went about 10-20 more mi. then the 1 with it on
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Old 01-24-2008, 11:48 PM   #14
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I don't right away put the heat on full blast when starting the car, after the car is warm I'll put it on Medium you can say..
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Old 01-25-2008, 08:28 AM   #15
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my car decides how to run the temp for me

but my milage SUCKS right now too. a lot of idle time and mostly city driving. i get just a hair above 200 miles per tank now.
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Old 01-25-2008, 03:44 PM   #16
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Quote:
Originally Posted by Sleeper93
its been proven to.(i like to watch mythbusters). 2 SUVs were tested one with the Air Conditioner on the other with it off and the windows down and the truck without the A/C on went about 10-20 more mi. then the 1 with it on
But look at what speed they were going. You start pushing 65, 75, or beyond mpg, which has more drag? A/C or open window?

[/end off topic]

Just remembered, running the defroster kicks the compressor on usually too.
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Old 01-25-2008, 09:19 PM   #17
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Quote:
Originally Posted by Darrel
my car decides how to run the temp for me

but my mileage SUCKS right now too. a lot of idle time and mostly city driving. i get just a hair above 200 miles per tank now.
yea mine dropped down from about 3 and some change to maybe 230? maybe? i might be rounding up

and the speed of both were about 45mph. but i thought that drag holds the car back. and with the windows open air is rushing inside messing with the aerodynamics and in doing this the car would have to work harder to maintain the speed thus using more gas. but in the study the A/C running car lost the challenge. so that why i said what i did about the A/C
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Old 01-25-2008, 09:26 PM   #18
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Quote:
Originally Posted by Sleeper93
Quote:
Originally Posted by Darrel
my car decides how to run the temp for me

but my mileage SUCKS right now too. a lot of idle time and mostly city driving. i get just a hair above 200 miles per tank now.
yea mine dropped down from about 3 and some change to maybe 230? maybe? i might be rounding up

and the speed of both were about 45mph. but i thought that drag holds the car back. and with the windows open air is rushing inside messing with the aerodynamics and in doing this the car would have to work harder to maintain the speed thus using more gas. but in the study the A/C running car lost the challenge. so that why i said what i did about the A/C
hmmmm, I don't know how much city driving you guys are doing, but I have a VERY heavy foot and still get almost 300 out of a full tank, and my O2 sensor is pretty much dead
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Old 01-25-2008, 09:28 PM   #19
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20 mile drive, about 35 min... thats my one way commute.

i'll let you know what i get for milage going up your way tomorrow though. i don't expect it to be great.
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Old 01-26-2008, 12:08 AM   #20
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Quote:
Originally Posted by Sleeper93
not thread jacking but your saying that when i first crank up my car and im driving around, keep the heat low? i didnt think that the heater core running on high would drink gas. i thought the A/C only did that. also to isnt it true the higher grade of gas you use the better the MPG?
Ony my car if you keep the heat low (read: no flow through the heater core), YES, the gauge does move up quicker off the cold mark.

HOWEVER, once it starts moving up and I crank the heat up, the cold stuff in the heater core circulates into the system and my gauge goes down a bit... might be a bit of a moot point. Nowadays I just keep the system on full heat full time.
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