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Old 02-04-2012, 01:30 PM   #21
sreigle
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Quote:
quote:Originally posted by mlh

When Cummings put a DPF on the Dodge trucks they reduced the service life of the engine by 100,000 miles.
Probably ought to point out, just to clarify, that Cummins says 450,000 miles for that engine (with the DPF) and Dodge says 350,000. I doubt I'll live long enough to hit either of those numbers, though.
 
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Old 02-07-2012, 04:08 AM   #22
RonD
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Our 2012 Dodge 3500 with Montana attached, average 60 mph tow, in the west, up and down hills is at 10.2 mpg, truck highway empty 65-70 mph 16.2 mpg. I expect it to get better with more miles.
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Old 02-10-2012, 04:35 AM   #23
steelpony5555
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I let my truck tell me what speed it likes. I know if I go slower I should save on fuel mileage but I would rather the truck be comfortable more then saving a mile per gallon. If I get below 60 it will lug at times when it starts up grades. So I set the cruise at 65 and she just purrs along. At 65 it will take a pretty good or long grade for it to drop down a gear. When I had the 5.9 Dodge I got 11.5-12.5 per gal. at 65, now with the 6.7 Dodge I get 9.5-10.5 per mile. The biggest thing that affects my mileage is wind. Weight does not seem to affect it much at all and miles per hour has a little affect, but wind is like I got a hole in the tank. Besides that 1 more mile per gallon just means you can go maybe 30 more miles per tank full which would save maybe $6-$10 a tank.
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Old 02-10-2012, 08:04 AM   #24
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Our MH has an 8.9L 400 HP Cummins. It can take the weight and the hills fine, but the biggest factor to bad fuel mileage is a head wind. It has enough power so it doesn't drive any differently (like down shift), but the fuel guage goes down quicker.
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Old 02-10-2012, 02:41 PM   #25
Phil P
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Hi

We started pulling the Montana with about 500 miles on the truck. We average 8 mpg until we hit 30,000 miles. Then the mpg started improving noticeably. We now have 65,000 miles on the truck of which 35,000 is with the Montana. We now average 12 mpg loaded at 23,000 lbs with the Montana and 16 mpg unloaded until you get in the mountains then all bets are off. We run 60mph when towing this seems to be the most efficient.

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Old 02-10-2012, 08:52 PM   #26
Bill-N-Donna
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After going through our previous camper/truck and removing a lot of extra weight I could see a difference in that it felt like it pulled somewhat easier. I really didn’t notice any mileage improvement but I’m not saying that it didn’t help. I was merely trying to lighten up the load. I get about the same as you 8-9 MPG when towing. After owning a M/H where I got approximately 4 MPG I’m very happy with 8-9 MPG anytime. These are large heavy rigs and as long as the tow vehicle does a good job I’m happy. I’ve been in situations where we’ve wondered if we were going to get over the next hill. After those experiences Mileage isn’t a concern anymore. If the truck is running great “I’m a Happy Camper.”
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