1975 H70 w 6V53. Mpg?

[greywuuf]

So I have a dream a truck and some time. I know Detroit's are thirsty....but given that I have a "7500" series with a 6V53n that I plan to road trip with. What is my best option for maybe the best mileage ? Currently it is a single speed with a 5 speed and 20" splits....hoping to go 22.5 one piece . Also open to transmission upgrade. I figure a little taller tire and keeping it light are about all I can do to see better fuel consumption. Anyway a small camper shell, lightweight pop-up tent style less than 1000 pounds all loaded up, and not sticking up in the wind. What kind of fuel burn am I looking at ?