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If you get the Cummins 600 don't expect more than 13.5MPG avg. city driving and 17MPG avg. (empty) on the hwy at 75MPH. I have 17,000 miles on mine and love the hell out of it, but it doesn't get the mileage I expected from a diesel!
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What rpm's are you turning? I found 67 mph is the sweet spot with my 4.10's. I get about 21 down flat highway and about 53 going downhill /forums/images/graemlins/rotfl.gif
My last hand calculated average from the last tank which was about 50/50 highway/city was 17.6 Thats an 03 SO though, not HO.
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this is why i plan on stepping up the tire size on my rig a bit. somewhere around a 35 or 36 inch tire, but if i can find a SRW 19.5 inch rim they will be truck tires.
im getting about the same mileage empty, but got 15 to 16 with 9k weigh behind mine from oceanside cali to bosie ID and then to eugene OR.
mine is a 2004.5 with the HO and 6 speed short box crew cab 2x4, 4.10 rear. i also want to put the 3.92 in it.
im ditching the cat as soon as i get back from iraq, so ill let ya know how well it works then.
i LOVE MY CUMMINS AND WOULDNT TRADE IT FOR ANYTHING.
Grant