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Well there may be some truth to what Domman is saying, but I think it is less evident today than it was 20-30 years ago.
Depending on where you live, depending on how you drive, depending on your geography there are scenarios when the V8 will achieve better MPG. If you look back to 6s versus 8s and put them in a hilly area you can get better MPG out of the 8 because it has enough power to stay in a higher gear when driving through hills.
If you take the same setup (6 vs. 8) and place them in a city with stop and go traffic the 6 is going to win out because of less consumption at idle and acceleration.
Its the same way you can argue mass of vehicle. Reducing too much will kill your coasting capabilities. So you may be able to do more with more and not more with less.
BACK TO THE QUESTION AT HAND!
Some mods that might help your truck would be intake and exhaust, but generally with an engine that large you may end up using more fuel. The Dodge generally has enough power to do the job. Some of us with the smaller engines may see gains since you don't need to wind out the smaller engine when merging highways or trying to accelerate out from lights. Your Dodge @ 2,000 RPM is probably making more HP/Torque than the guys and gals with smaller engines are at the peaks.
The intake itself might benefit from the "warm air intakes"
But the truck might benefit from lowering springs or air blocking. You may not want to lower your truck if it is used as a truck :-p But the air blocks should do you some good.
Wheel skirts might be a large benefit on the truck. From what I understand the larger the wheel gap the worse your side aero works. Trucks have ALOT of suspension travel, thus ALOT of wheel gap. You could go full skirt, or even gap reducing arches to see if that helps your MPG.
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