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I engine ON coast in neutral on downhills.
I have 255k on the tranny &(rest of the car) so I know, for my car, it doesnt hurt anything.
Not sure how that works with a chevy truck.
YOu probably have a prtty firm ride.. but punmp the tires up.
I'll let one of the truck guys chime in though for psi #s
I run 43psi with nitro.
Also, not sure how you are about a/c and windows...
But I installed some window visors and can crack the windows about 3/4 inch and hardly increase the noise level. Also keeps me from having to hit the a/c.
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