On my 300 mile trip home from the dealer, 15.6mpg. I know it's literally brand new but that completely sucks for averaging 1600rpm. The next short highway trip 100 miles came in at 13.8. I went out of my way to get the 3.42 rear, as my 2004 cummins 3500 DRW w/4.10 only gets 15-16 @ same speed 75mph.
My past two cummins only improved +1 mpg when "broke in". I like to hear from others with the HO 800ftlbs cummins, state your rear gear ratio please.
Honestly, I wasn't expecting much but with the 3.42 rear, 18+ mpg is not a high bar for 1600rpm. I wonder if an HHO would help or would the computer override the benefits.
In '04 I was convinced the 4.10 gears would be better for us as our '99 had 3.73 rear and died on hills. What a lie! The '04 with Edge/juice is actually just as or more powerful than out new truck. Now we're having to spend $2k to have the 4.10 swapped for a 3.42 ratio. While we tow 50% of the miles, our rig is only 5-7k lbs and sometimes another 2-4k in payload. Not much at all for these trucks.
07-24-2011, 08:40 AM
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