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knite -> RE: DURAMAX (2/9/2007 10:35:19 PM)
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Just traded up my 2005, 3500 with 5 speed Alison for an 07, 2500hd with a 6 speed Alison. The power difference both top and bottom end snaps my head back in the 6 speed verses the 5 speed. I haven't really stomped on it yet as I am still breaking in the engine but the difference is really noticeable. I am having serious issues with the difference in gas mileage though. The 5 speed 3500 got 13 -15mpg in the city and 18 -22 mpg highway from day one of owning the truck. The 6 speed 2500 gets 8 -10 mpg in the city and 14 mpg at best highway......sure I only have 200 miles on it but, come on, how much does the break in really effect the gas mileage? I am thinking that I may have a problem with the truck but the dealership swears that after the break in period the mileage will improve........I doubt it would improve that much though, right? I hope I am not wrecking anything more by driving it and not getting it checked further, but like I said the dealership says nothing is wrong just because of the mileage. I even told them that it backfired on me once and they said it wasn't a big deal. I just have a bad feeling about it, does anyone have any suggestions?
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