2000 Tahoe bad mileage

[dbest]

Hi guys,
I recently got a 2000 Tahoe Lt with 174,000 miles and a new trans at 162,000. I am consistently getting 12 mpg. I am not a lead foot and drive conservatively. I have a friend with a 2003 Tahoe with 186,000 miles who is a fire chief which naturally leads to aggressive driving habbits and he consistently gets at least 15. What's going on here? Thanks

 

[dbest]

Nobody's saying anything, this doesn't give me much hope

 

[03tahoe2012]

hmmm im a really aggressive driver being 18 and all but im getting around 12 and i have an 03.

ac always on?? or heat? idk thats weird

 

[SunlitComet]

tranny fluid pressures may be to high.

 

[dbest]

hmmm im a really aggressive driver being 18 and all but im getting around 12 and i have an 03.

ac always on?? or heat? idk thats weird

ac is never on and only heat partially or for defrost

 

[jplinville]

how are you calculating your mileage?

 

[dbest]

trip odometer divided by gallons to fill up

 

[94z28guy]

Mine is ****** also, of course I hae a pretty mean exhaust manifold leak. I also have a weak upstream o2. So if you have any of those 2 that will hinder mpg.

 

[trublew]

12 isnt bad,. thats what i get with mixed city/hwy driving. things to check are fuel filter, air filter, typical tune up etc... if his is a 2wd, they get better mileage as well than a 4wd truck... gears also affect gas mileage, so theres alot to compare here...

 

[Big O]

stock tire size? psi in tires? grade of fuel? filters new/clean?

 

[dbest]

everything is stock as of now, tires are at 36 psi, 87 oct. just blew the air filter out with a compressor but i am going to put a CAI and a new fuel filter in

 

[ThwopKing]

Time for a tune up? time for new O2 sensors? time for fluid change in the diffs? time to clean throttle body?...any of those can create sub par mpg's. Also blowing out an air filter really only cleans out bigger debri just "sitting on" the filter. To much compressed air blowing through it can actually tear the filter and let in more dirt.

 

[a4edwin]

damn mine says average 9mpg. keep my temp inside the truck at 78 but a/c seems like i hear the compressor going on and off.

 

[Awakened]

You might get better mpg's with higher octane gas...results have varied with that tactic.