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Old 11-02-2007, 04:20 PM   #43
Classic 30
Sky's Avatar
Sum Wear , Ohio
Join Date: Mar 2005
Posts: 570
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When I towed 8000 lbs from OH to AZ and back, with a 06 DMax, my MPG ranged anywhere from 10 and 16.5 hand calculated. My DIC (computer mpg readout) always reads a little low. It is very obvious that grade, wind, and road conditions are some of the major variables in mpg performance. I can see my DIC readout change in real time whenever any of these variables starts changing. I even see my mileage increase after transitioning from a noisy concrete stretch of interstate onto a velvety smooth asphalt surface.

Since I have learned to trust my DIC, I use it to optimize my mpg by looking at the results instead of the inputs. I know my best MPG is somewhere around 60, so I reset my DIC and move up and/or down from 60 (using cruse control +/-) to pinpoint my best MPG performance. If road conditions (vibration), elevation (GPS), or wind (trees and grass) change, I reset the DIC, and hunt out the optimal point using the cruse control again. I normally don't have anankastic personality disorder, so I only do this when I get bored.

But, I must admit, a couple new gauges in the old truck would be very cool.

"Only dull people are brilliant at breakfast" - Oscar Wilde

2500HD DMax............30' Classic
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Old 11-04-2007, 10:35 AM   #44
pmclemore's Avatar

2012 30' International
Walkerton , Virginia
Join Date: Dec 2003
Posts: 2,554

When I bought the rig in NM last summer and was bringing it back to VA, I noted that I was getting about 11mpg (I was used to 13 with the 25'Safari) and was thinking that that was just the price of a much heavier rig. By the way, these were calculated numbers, not those on the trip computer - I find those to be generous.

Anyway, I had a minor breakdown in AR and while I was there the foreman offered me a free trial of the Bully Dog. I took it, and carefully monitored engine and tranny temps, oil pressure and the like, just to be sure everything was ok. It was. And, I was looking for fuel much further down the road than before. I think it was calculating to about 13. But we were travelling relatively light - no camping gear and just enough water to flush, etc.

This last trip west to the balloon fest and beyond, we travelled about 7k miles and the mileage overall was 12.5. Full camping gear, full fresh most times, clothes, groceries (as we were dry camping a lot).

And you can feel the extra power.

So - in my humble etc - I think it is more than smoke and mirrors.


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