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Old 06-03-2018, 08:08 PM   #21
Sleeve66
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Location: St. Helens
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Fuel MPG

You should be able to get at least the 10 that you are looking for. If not then look in to a programmer and maybe an upgrade to your intake system. Or if you don't feel comfortable with playing with a programmer then it would be worth the money to take your rig to a diesel shop that specializes in aftermarket emissions.
I am running a 2000 Ford F-250 superduty 4 door cab long bed pulling a 37' Cougar SRX. I am averaging 15 to 16 mpg pulling it around Oregon and Washington. I have a cold air intake system and a Edge programmer. I run it in the tow mode all the time and it get's me the best overall performance. If you bump it up to the next mode it starts to blow smoke which is just wasted fuel.
If you don't have to take your truck thru annual emissions tests then it is worth it to have your egr and after treatment filter removed. Like I said talk to a local diesel shop, not a dealer to find out what you can do to get the best MPG. Good luck and I hope this may help you out.
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Old 06-04-2018, 06:12 AM   #22
JRTJH
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Quote:
Originally Posted by Phil Saran View Post
We have a 2012 Dodge Ram 3500 6.7 diesel, 3:73, 4 dr., 4x4 6.4 bed with a
B&W sliding hitch.

At the end of June we will take possession of our "new to us" 2018 Keystone
Cougar 30RLS that is a 6 month old owner release back to the bank "repo".
for about 1/3 the cost of new. My last RV was a MH and got 7 MPG towing a
4K 2011 Dodge Dakota 4x4. The 5th wheel weights in at about 12K and I hope
for 10 MPG.
Expecting 9-11 MPG while towing is achievable and should be what you see with "normal towing". Towing up mountains or fighting a significant headwind may affect that mileage. Expecting 15-16MPG is something most of us "only wish for" and very VERY few actually see that kind of towing with a large fifth wheel.
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2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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Old 06-05-2018, 11:11 AM   #23
BAPotter
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Upgrade

You may want to look at a 2015/16 GMC Sierra 1500 SLT Double Cab or Crew Cab with Max tow package, 6.2L gas 3.42 axle, 8 speed transmission. It produces 420hp/460lbft torque. 12,000 lbs tow/about 18,000 gross combined weight. It has heavier axles and brakes than standard 1500, extra leaf in rear springs and mine has air lift suspension also. It rides like a 1500 unloaded and a 2500 loaded. I live at 5,000' altitude and have to tow 6% grades to 10,000' Mine does really well.
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