All I could find was the capacity in Liters, not sure if you're in the US or elsewhere. But there is at least one confirmed source of it being 80 liters, which is approximately 21 gallons.
Filling mine up from about 1/2 of a tank was 10.4 gallons, so 21 gallons does sound about right.
I just bought a 1987 944, love it!
I have a 1988 Corvette and it has a 20 gal. capacity
18.5 gal
The fuel tank capacity of the 1988 Hiace from Toyota is 16 gallons. Regular unleaded gasoline is recommended for this van.
On a 1989 Toyota Camry, the fuel tank capacity is 15.9 gallons.
17.6 gallons
50L
The 1998 Cadillac Brougham has a fuel capacity of 25 gallons.
16 Gallons
8.41 U.S. Gallons
My '88 4x4 has a 17-gal tank.
1988 Ford F250 front tank is 19 gallons and rear is 18.2.
The fuel capacity for the first generation MX-6 is 60 Litres, or 15.9 Gallons.