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You're mpg's will increase. I averaged 11 mpg until the truck hit 1500 miles or so. I'm at 4500 miles now and usually see 13-14 mixed driving. Really not bad for a trucks that's over 7000lbs.
I have the afe mach force cat back. It too drones quite a bit, mostly 1500-1800 rpm range. I usually lock it in 8th using the gear selector to disable mds.