Look in your owners manual, it tells your fuel tank capacity.
Cadillac has never manufactured a car called a GTS. However, the gas tank on a Cadillac DTS is 18 gallons.
20
14
the fuel tank is 18.5 gal.
Take it to the dealership.
40 gallons
10000
it depends on how much gas you got if its empty empty it should take up at least 18-19 gal.
it take 15.2 gallons
Two gallons
should be right at 18 gallons. give or take .5 my 2001 is 15 gallon tank with 16 cty / 19 hwy mpg
90 gallons