I recently bought a used 98 k3500 extended cab dually with a 350 vortec and
the 4L80 transmission. I am getting about 11 miles to the gallon. It seems
pretty consistent whether pulling, towing, or town driving. Is 11 miles to
the gallon good or should it be a little better? After driving and exiting
the vehicle I always smell gas fumes but have detected no leaks.
sounds about right to me. Whats yoru rear differential gear? Could be
a little better with a tune up ( the works), I had a 89 3/4 4x4 ext.
cab with a 350 and after a good tune up i went from 9-10 to 12.5 mpg
I have a 2000 GMC Sierra 3500 with the 350 vortec and 4L80E and getting 13
MPG around home and I am not happy with it either. Around home for me is a
rural area and I think it should do better. Haven't had it on a road trip
yet so don't know what to expect there.
Have to admit it runs good so I haven't even looked at the plugs or
anything. Could have original ones in it for all I know. It has 112000 on
it, and is also a crew cab, but wouldn't think the CC would make much
difference on gas milage.
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