Average MPG

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YukonJ

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Dec 1, 2010
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first two tanks after I got it...10mpg! (city) ( 01 yukon XL 2500 with 8.1L 4.10rear) I've run through two tanks now with 2stroke oil and it's up to 11! I was planning to do the swiss cheese mod but not sure now after reading some of your posts.
 

blueflamed03

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May 4, 2009
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Oklahoma
Not with 24s you aren't.

unless he's on one of these...
GMC_Tow_truck_RR.JPG
 
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bdesr32

bdesr32

TYF Newbie
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Oct 14, 2010
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Torrance
What about a bad fan clutch can that kill my mileage if it's not working right, I should really convert to electric but no dough.
 

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