I am trying to see how accurate my gas gauge is on my 1965 Cutlass but I do not know the capacity of the tank????

 

I'd say 20 gallons. That's what the replacement tank is.

http://www.quantaproducts.com/prodin...?number=GM-37A

 

Thanks, gearhead1218, That's about 76 liters which is what we pump here. So when the gauge reads 1/2 then i should pump 38 liters. If you are wondering 95 octane is about $3.15 a gallon. We have 91 and 95 E85 (gasahol) which is a mixture of 15% ethanol and 85 gasoline. I run the Olds on 95.

 

I run about a 50/50 mix of 93 octane @ around $3 a gallon, and Sunoco 260 which is 110 octane at $7 a gallon.