Aztec Usable Fuel Capacity

[JoelCarter]

I have a POH for the 1960 Aztec that clearly states usable fuel capacity of 144gallons and even states range numbers based on 144 gallons,i.e..65% range of 1200 miles @ 200 MPH using 24 GPH. That's 1200 miles divided by 200 MPH x 24 GPH = 144 gallons. Yet everything else I read states total capacity 144, 140 usable. What gives?

Thanks,
Joel

 

[philiplane]

 

[JoelCarter]

 

[JimICS2452]

 

[JoelCarter]