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I have 28k miles on my car and have been running my tires at 38 - 42 psi most of the time and have not noticed any uneven tread wear though I think you have different model tires then the '08 XFE so the tires may act a bit differently but you should still get benefit form having them at 34 - 37 instead of 28 - 30psi.
You have a 13 gal tank? I rode my car 40 miles after the gas light came on and I still was only able to put 11.5 gal in the tank.
I can definately see the usefullness of having a CB and I doubt it's causing you to lose any more then maybe 0.25 - 0.50 mpg average. Now the people that fly those sports team flags from the car are the ones really dropping their mpg by 1 or 2.
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Lifetime mpg
2012 mpg
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