I've got the 5.14 in my truck, with the mighty 216. With a light foot, and not going over 40 mph, I get 16 mpg. BUT, I'm generally driving at about 30 mph in fourth, so the truck is not working. I have noticed when Its raining my mileage drops a bit, what with the vacuum wipers. My 216 is in pretty fine shape though.

Christopher
1950 1-Ton
"Rochester"
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1949 GMC Panel Truck
1926 Model TT Truck