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post #1 of 46 Old 01-09-2011, 02:38 AM Thread Starter
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poor gas mileage?

so i've noticed more and more lately that my v seems to eat up a lot of gas, and quickly. probably happened around the time i had some issues with my o2 sensor. but its causing me some concern now.

was wondering what i could do myself before having to take my v in for some diagnostics or even some routine maintenance

any ideas or help would be greatly appreciated

**
I've also included a little picture of a v gas gauge and will explain an example of my concern. My gas runs low (bottom red line) and I fill up (to about the top red line) and drive for lets say around 100km (62miles) and my gas dips down to the half way mark which to me is pretty darn quick. Unless im looking at this wrong. If anyone can quell my concerns that would be great
**
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post #2 of 46 Old 01-09-2011, 03:32 AM
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you can run down until your light turns on and then fill up until you have even amount of gallons. dont worrie about price being like 31.67 as long as you have like 11.000 gal or 12.000 your good. thean clear out your mileage and drive until the light goes on again. and when it does just look at how many miles you just did with 11.000 or 12.000 gal. and then just do math. how ever many miles you did divided by how many gallons you filled up with. hope that works
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post #3 of 46 Old 01-09-2011, 09:46 PM Thread Starter
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yah i'll give that a try. i've also read up that a dirty air filter can cause poor gas mileage as well. any thoughts?
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post #4 of 46 Old 01-09-2011, 10:09 PM
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Yes it can, but it would be obvious if the filter is dirty once you look at it. Go ahead and upgrade to the k&n panel if the filter appears dirty, save you some money in the long run and give some (negligible) HP gains. Dirty MAF sensor, bad O2 sensor, and the air filter are the most common causes of loss of MPG.
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post #5 of 46 Old 01-10-2011, 12:13 AM
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yeah i just changed my air filter also it does effect gas mileage but shouldnt be by much. how many miles does your v have
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post #6 of 46 Old 01-10-2011, 12:54 AM
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It does seem like you are getting low mileage. How are your driving habits? Do you let the car run for a long time to warm up? Take off hard/fast from starts? Drive over the speed limit? It also depends on if you drive city or highway. My mileage has dipped down lower with winter and running the defrost on and letting my car warm up a bit. As another member said try running it down until its low, then fill up until the pump clicks off. Continue doing this and find the average over a few tanks. Fuelly.com can help you calculate your mpgs.



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post #7 of 46 Old 01-11-2011, 05:09 AM Thread Starter
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my v has just over 53,000k on it
and i've not changed my air filter so i should def do that lol.. my bad
this is my first car, so im not all up on what to do maintenance wise :P

and my driving habits have been the same since i started driving, so i dont think its my habits lol :P
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post #8 of 46 Old 01-11-2011, 01:05 PM
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at your mileage the only thing that needed changing besides oil is the in cabin filter and air filter. I myself would get a quality paper filter like OEM or WIX. I don't like the KN or any oiled filter.

You do sound really low on the mpgs. It could just be winter. I don't know if they mix the gas up there for winter or maybe your letting your car warm up alot longer since cold. No matter what in the winter you will see much worse fuel economy.


205,125 miles when she was given away
35 mpg last tank


̶w̶a̶i̶t̶i̶n̶g̶ ̶f̶o̶r̶ ̶h̶e̶r̶ ̶t̶o̶ ̶d̶i̶e̶ ̶s̶o̶ ̶I̶ ̶c̶a̶n̶ ̶b̶u̶y̶ ̶a̶ ̶t̶r̶u̶c̶k̶,̶ ̶b̶u̶t̶ ̶s̶h̶e̶ ̶w̶o̶n̶'̶t̶ ̶d̶i̶e̶ She didn't die but I bought the truck anyway!!
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post #9 of 46 Old 01-15-2011, 03:20 AM Thread Starter
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well im gonna change the in cabin air filter as soon as possible, probably when winter goes away lol.. any recommendations for where i can get in cabin air filters??

and i dont really let my car sit and warm up before i start going. I just get in and go, i wait a bit then turn on the heat. so i dont think its that i let it warm up too much.

and well it was even before winter i noticed this. i've also noticed if lets say i fill up to my usual as i said on my first post it drops to half tank quickly, but then lets say 2days of driving to and from work the gauge doesn't move but then lets say the 3rd day of going to work i start to see the gauge move again. Its almost as if theres a problem with the gauge maybe? I find that strange.

Should I take my V into a mechanic? cause gas is killing me lately.
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post #10 of 46 Old 01-15-2011, 06:38 AM
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do you drive with the AC ON a lot?
do you have manual or automatic?
how often do you change the Oil? every 3,000 or longer?
when was the last time the air filter was changed?
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