I am thinking of purchasing a 2004 Silverado 2500HD with the Duramax 6.6 and
Allison trans. I hear the mileage I should expect is about 16-17 city and
19-20 highway (65-70mph) not towing. Towing is a whole new story - I
wouldn't expect much more that 11. Most of my driving will not be towing.
When I do tow it is at least 250 miles at a clip.
Are these non-towing numbers mileage numbers in the ball park? Any insight
on this truck is appreciated.
My 2005 GMC Sierra 2500HD with Duramax & 6sp manual trans does 18 city
& 20 - 22 highway. The local truck stop I frequent offers premium &
regular grade diesel. It doesn't seem to matter which grade I buy, so
I get the regular grade as it is cheaper.
My '04 Chevy 2500HD Crewcab 2wd with the Duramax and Allison gets me 17
during my morning commute (45 minutes, max speed 55) and 20-21 on the
highway at 65-70mph. Every mph over 75 or so sees a decrease in mileage
(the price you pay for driving a vehicle that big). At 80mph and I'm
getting 14-15 mpg. I've never had any long distance sustained speeds over
80 to measure the mpg.
Cheers - Jonathan
That is about what I get in city driving, 2004 Sierra Duramax LB7. Also
about 15 to 16 pulling a 5000 pound trailer in the Rocky mountains.
Filled up this morning: $2.20 a gallon!!! - Denver area. Eight miles to
FlyingJ where they have it for $2.12.
I'm just back from a 7000 mile trip hauling a 3200 pound travel trailer with my
'04 D-max crewcab w/ Allison. Rig gets 16.5-17.0 towing and 20-22 non towing.
Now has 10,000 miles on it. Around town short-trips sucks it down to 16 and
slightly below (non-towing of course).
"Don't undertake a project unless it is manifestly important and nearly
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