I just got 10 mpg towing a 2 place open snowmobile trailer with 2 sleds, I love the truck but the mileage sucks. Same trip last year with my 05 d-max I got 14

 

18-20mpg for a deleted truck, 14-18mpg for a stock truck. Some gain more than others do, typically you gain 2-4mpg on a delete. The real monetary gains are from the reduced maintaince from the lack of soot and replacement of your emission equipment. Fuel mileage gain, is a nice weekly payback, and the reduced oil changes/services.

 

Well I have 1100 miles on this truck. I think I will go with the Smarty when it comes out

 

I have a 2011 Ram 2500 6.7 Cummins 4x4 with 35" all terrain tires and have 28.000 miles on it
I was pretty disappointed with the mileage, I was getting 12 mpg around town and 14 on the highway
I have a 10,000 pound boat and that would drag the mileage down to below 10 mpg
I am seriously considering trading it in for something else
As a last ditch effort I pulled the EGR plug two days ago and now I'm getting 15 town and 17/18 highway, still not the 22 mpg the dealer told me when I bought it

 

Your salesman lied!!

Besides that you are also running 35" tires. You just increased the rolling resistance, the wind resistance both around and under the truck and it takes more effort just to get the truck to start moving from a stop.
If your mileage is hand calculated taking in account for the size difference you should be happy with 15 town and 17/18 highway.

 

Thanks, I'm just going by what it says on the Fuel Economy Gauge.
Actually Yesterday I had a half ton of hay in the back and today unloaded it says I'm getting 20 on the highway... seems it's picking up

I'm not a rocket scientist but since I have big tires my speedometer is off by 9 or 10%
So I'm going 65 when the speedometer says 60
I'm guessing if that's the case I'm getting 9 or 10% better than the economy gauge indicates
Is that right?

I reset it after getting fuel today and here's a pic after 30 miles later on the highway... 114 degrees outside

 

When my truck was new, I saw no better than 15mpg. Once the truck accumulated 20K miles, the mileage improved. Several items make big differences. Air pressure on the tires, you must run 50-55psi. Speed, the best mileage occurs at 50 mph. Any speed above than diminishes the consumption progressively. A tuner will gain you about 1 mpg. I get between 17 mpg and 21 mpg empty, if I drive sensibly. The more work you ask the truck to do, the more fuel it takes. Since this thread is about economy, be careful will the tuner thing. that extra HP is created by advancing the initial injection event and raising the fuel pressure at the rail. The increased rail pressure WILL erode the injector nozzles much faster than with the factory pressure and they are not inexpensive. So my advice is to use the lowest performance setting you can live with and dial in the performance pressures only when you need it. $3000 for a set of injectors buys a lot of fuel!