13.4 us gallons
divide 275 by 8
It all depends on the car. You can look at the owners manual and you will see.
There are peanut tanks and the fatbobs, as well as lots between them - both OEM and aftermarket. The peanut tank holds a bit over 2 gallons (maybe 2.25 or so), and the fatbob holds about 5 gallons.
52995.764976mL = 14 US gallons63645.26 mL = 14 imperial gallons