vtunimog

He is lucky indeed to get that mileage. The average is more like 7-10 max. I had a Swiss 404 that I converted to a Pertronix, Bosch copper core wires and NGK 5PES plugs. I think I estimated about 14-15 mpg wihich isn't bad for a little 2.2L 90 hp motor pushing a square 5700 lb 4x4 down the road.

One of the greatest improvements I ever made was a Carb conversion. 50% of the problem with these trucks and their power/economy and reliablity seems to lie in the miserable zenith carb. They leak, they are hard to tune. If they sit more than a month their seals dry out. I did alot of trial and error and after about 32 trucks I found that just swapping out the carb helped greatly. It's not a cheap process but the Carter/Holly I used/modified works great - perfect starts, pretty good power ( I woiuld estimate a 15 hp gain maybe?) and decent economy. the conversion takes a couple of ours and I had an adapter block machined from the existing zenith spacer.

If Anyone wants a carb I have one left.