Ol Dirt Contractor
Join Date: Dec 2008
Location: Minden Nevada
Thanked 318 Times in 212 Posts
Our 5DS motor has always been better on fuel mileage than people give them credit for. Last summer my son was running out of town in the middle of nowhere with a couple of new Cummins ISX motors. Hauling the same loads in bottom dumps, 80K gross, same speeds, all staying at the same motel, fueling at the same pumps and averaging between 20 and 25 gallons less fuel a day than the ISX's were using...
But of course running at their speeds on the hills he could keep a light throttle on the 5DS and he is used to soft pedal on that motor anyway. At the 1500 rpm sweet spot going up the hills he had to back way off just to keep from running over them.
I followed him about 50 miles in California traffic with the PU just after they put the DPF on and absolutely zero smoke. Not only that, the new exhaust stacks were absolutely clean after 50 miles just like a new emissions motor running DEF. We had to go to 90 degree 5" stacks because the emissions people want to keep the rain from getting in the DPF. I doubt moisture would ever reach the DPF with straight twin stacks buts that's their call...
The emissions people didn't know much about the 5DS motor but they were shocked at how clean it was before and after the DPF installation. We had to run an onboard opacity monitor with recording ability for about a month before they would OK the installation of the DPF due to the fact they had no experience with that motor. But keep in mind my son drives with a light foot as I did before he took over the truck.
People ask why didn't you get a new truck? Well, a new heavy haul truck set up the same way would be in the neighborhood of 160K and excise tax to boot.. Plus license and reg fees much higher, insurance also... And I believe the 5DS will out preform the new motors both in fuel mileage, (no DEF additive either) and power.. Also, a new truck is heavier by a thousand or two...
I can't help but think with the ultra low sulphur fuel and newer DPF design Cat might have been able to keep going with highway motors similar to the 5DS.
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