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My "old" '85 Silverado with a 305, 700R4, and 3.42 gears was getting anywhere between 11 and 14MPG back when I was actively calculating gas mileage.
I recently upgraded to an '86 Sierra with a 350, TH400, and 3.73 gears. I haven't worked out the mileage yet. However, on the old '85 Silverado I was doing about 200 to 250 km per tank (down to 1/4 tank left), and now with the '86 I'm doing somewhere between 150 and 200km per tank (again to about 1/4 tank left).
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