That's interesting, my 70 owners manual (which came in my first longhorn built in 4/70) on page 88, it says 10 - 30 series has a 20.0 gallon fuel tank standard...that same tank is 16.75 metric gallons though.
In my 69 GMC owners manual, it sway 1500 - 3500 back of seat tanks are Approximatly 22 US gallons.
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