1978 dodge power wagon?

OK, from a old guy who has 3 late 70's Crew Cab 4X4 Power Wagons, all with Dana 60 front ends, they are awesome trucks "for their year". I also have a 77 4X4 Power Wagon that's an origional 440. it however needs floor pans put in it. (A Flintstone Mobile) as you would say. All their trucks had rust issues usually because of poor sealing windshields, they would leak water in under the floor mat and it would sit there and rot out the floors. One of my 3 Crew Cabs is in excelent shap but the others have floor issues.

To your question though, gas mileage is like most other trucks of that era, 10 to 14 mpg. There sweet trucks but heavy. You have to search your sole to see if you want a nice truck or a nice "A" or "B" body!!!