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Discussion Starter · #1 ·
For the last year my mileage has decreased from 14.5 down to now 12.1 I have ran RP oil up until abot 100 miles ago then I switched to Penn Platnum. I have 33000 miles now. I have the same driving habits as always. I keep the tires inflated to 35 lbs. I always keep clean air filters. Do you guys think it could be the o2 sensor or do any of you have any ideas. I have a 05 kc 4x4 big tow.
 

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Winter fuel is my guess.
 

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Discussion Starter · #3 ·
I realize about the winter gas I keep logs and in may and june I was getting 12.5 in march of 06 I was at 14.5 same route to work every day no city driving.
 
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