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what if ive been b!tching for nothing about my milage. Did the 04.5 chevys come with 245s of 265s? ive got 265s on the truck now, thats what i bought it with. If I was handcalculating my miles based on my odometer then they would show less MPG than what im really getting. Might have to get the speedo checked.
 

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2500 - 245
3500srw- 265

If you have 265's on and your truck came with 245's you will be traveling further then your odometer reads so you will need to adjust your calculations accordingly.
 

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yes
 

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My 2500 came with 245's, but I don't think that it is enough of a difference to cost you more than maybe 15 to 20 miles per tank. That isn't enough to get me from 14 up to 18 or 19 mpg, but I had mine reprogrammed for the tires.
 

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duffy who reprogrammed yours? If you think the dealer did, you're wrong. They do not have the capability. They can change your ABS but they can not change your speedo or odo no matter what they told you.
 
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