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i would like to apologize if this post is in the wrong section.
when using cruise my truck isn't very good at keeping it close to the speed i set it at. sometimes it decreases 3-4 mph before it downshifts or it slowly increases throttle to get back to the desired speed. i assume it's because of the fuel economy standards they are trying to achieve. is this normal? the truck came with 20" 35s and i'm pretty sure the speedometer wasn't reclaibrated for the now tires.
 

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The 35's probably have something to do with it. Are the roads level when this happens? Mine will slow down and speed up depending on the road grade and will downshift if the grade is steep enough.
 

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Mine usually stay's within 1mph of the set speed, I think I may have seen 2mph but that's a rarity.
 
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