1) What are you driving?
2005 Dodge Ram 2500 long bed quadcab Texas Longhorn Edition SLT Cummins Turbo Diesel Automatic
2) What gas mileage do you get without trailer?
22 to 25 on the highway
3) What gas mileage do you get with trailer?
14 to 18 on the highway with about 1/2 tank of water (325 gallon tank), 16 to 20 with 60 gallons water depending on wind direction
4)What it is the weight of your trailer
have a scale ticket with 60 gallons of water in the tank at 4850 pounds, it is a 325 gallon tank but I try not to haul water but usually have 1/2 tank of water most of the time after bending 3 axles with the old trailer hauling a full tank of water to some jobs, I try to not haul full tanks of water anymore, gets expensive changing axles, brakes and tires when you bend an axle.
I have had 3 different contractors with me in the truck and showed them the mileage with and without the trailer working and going to round tables/events/meetings/estimates in the truck and they could not believe ho good of mileage I get all the time, I really love this truck, wish I could buy another identical to it.