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Two thousand mile plus trip report  RSS feed
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Joined: 22/09/2009 11:20:58
Messages: 3
Location: Tallahassee, Florida
Just returned from a round trip to Baltimore, MD with essentially all the driving on Interstate or US highways except for passing through small towns in SE Georgia on US 82 and 84. Hand calculated mpg (odometer reading corrected to match GPS and with all fill-ups showing clear unfoamed fuel at the top of the filler neck) ranges from a low of 29.7 (some rain and consistent headwinds) to a high of 33.9 (61-62 mph or 1,800 rpm with/without AC) with a whole trip average of 32 even. This is my second KJ diesel, the first having come out second best when I stopped for the red light and the dump truck behind me did not, and both that KJ and this one (both 2005s) typically got 28 or a bit less mpg in similar driving situations. Hence I am seeing a net overall mpg improvement with the GDE tune of 10-20% depending on speed, wind, ac, road condition, etc.

As to in town (25-45 mph with lots of traffic lights and a 1-way daily 9+ mile commute) I am less sure of the results but based on one tank full and 425 miles I appear to be looking at about a 10% improvement from 20 mpg or a bit less to essentially 22mpg.

However, I do note a significant change in the EVIC reported mpg. Prior to the GDE tune my EVIC typically reported about 0.7 mpg higher than the actual hand calculated mpg. After the GDE tune the EVIC is reporting about 5-6 mpg higher than the actual hand calculated mpg. I don't have a clue how the EVIC calculates mpg but apparently the GDE tune "upsets" that function.

2005 Silver KJ Limited
GDE Eco Tune
Amsoil air filter
Cleaned MAP sensor
Samco turbo hoses
F37 without TCM reset

Joined: 19/07/2009 08:05:49
Messages: 15
Location: UP of Michigan
I would concur, if you look at my trip, I saw the same results, about 32 to 34 and the EVIC showing 36-37 or a bit higher.
Fun to see, but not really on the mark.

2005 Silver Limited CRD
GDE Eco Tune
PML Differential Cover/Crankcase Mod
Tal & Hadas Grill Guard/TransGo Shift Kit
V-6 AirBox/Lunar Boost & EGT
Lund Cold Weather Grill Insert
Cat 2 Filter, Cummins Lift Pump
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