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A 2mph hit in economy is about what one would expect with 4wd and OD locked out.
Why are you locking OD out when in 4wd? I do no think the Dodge Ram does that as a default, is it to keep the motor from lugging?
Manual locking hubs will net you a slight increase in fuel economy when the weather is nice and you do not need 4wd. It will not change a thing come winter time when you are in 4wd. If they make replacement hubs for your Dodge, I would get them..
On a side note. My Silverado does not have an aftermarket manual locking hub available. What I do when traveling long distances "when I haul the 5th wheel down to Florida for vacation" is to pull the front axles out. To do this, you need an old pair of axles so you can disassemble the axle and keep only the outer half shaft. then you install that only into the truck "essentially making it a 2wd". I have logs showing a 1.5mpg increase while towing doing this mod.
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