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What contributes to MPG?

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Old 02-05-2010, 11:56 AM   #1
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What contributes to MPG?

Didn't know if I needed to post here or in 1st gen section. Feel free to move it if I'm wrong.

Ok, I did some searching but couldn't really find an answer to all my questions. I have a 2002 AC V6 4x4 SR5 and my MPG recently took a plunge. About the first of the year I noticed I went from 15 MPG to 13 MPG city and about 21 MPG to 18 MPG highway. I know some of the main contributors to gas mileage are load weight, tire size, tire pressure, etc. but what are some of the smaller factors. Does bad oil affect it? Air filter? What can I do to help out my MPG. Sorry if I sound stupid or whatever but I don't know much about the interior workings of an engine. Thanks.
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Old 02-05-2010, 12:00 PM   #2
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I had a first gen with similar issues back in 07. I had an After marked K&N wet airfilter, the previous owner had installed the filter while it was too wet causing it to build up on the MAF sensor.

I would suggest cleaning your mass air flow sensor or maybe as simple as changing your filter.

Did you make any changes to your truck directly before this change? I notice you have a 6" lift, assuming you have 33's on your truck. Are you correcting for you tires when you calculate your mileage?
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Old 02-05-2010, 12:01 PM   #3
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Dirty filters, dirty injectors, dirty throttle body, heavy foot, low tire PSI........
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Old 02-05-2010, 12:02 PM   #4
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Quote:
Originally Posted by 98tacoma27 View Post
Dirty filters, dirty injectors, dirty throttle body, heavy foot, low tire PSI........
What He said ^^^^
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Old 02-05-2010, 12:03 PM   #5
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Quote:
Originally Posted by 98tacoma27 View Post
Dirty filters, dirty injectors, dirty throttle body, heavy foot, low tire PSI........
No heavy foot here... well, at least not on the road

I'm used to having pretty crappy gas mileage when wheeling but I haven't been off road in about three months so I can't use that as an excuse.
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Old 02-05-2010, 12:07 PM   #6
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Quote:
Originally Posted by luk8272 View Post
I had a first gen with similar issues back in 07. I had an After marked K&N wet airfilter, the previous owner had installed the filter while it was too wet causing it to build up on the MAF sensor.

I would suggest cleaning your mass air flow sensor or maybe as simple as changing your filter.

Did you make any changes to your truck directly before this change? I notice you have a 6" lift, assuming you have 33's on your truck. Are you correcting for you tires when you calculate your mileage?
I actually bought the truck with the lift on it so I can't blame that but I did change the tires out to 285/75/16 but that was the day I bought it and that was almost a year ago... My dad took the truck to his work one day and said the speedometer wasn't off at all... Should I still have to correct for mileage if the speedometer is right?
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