Well i have heard of a centurion classic(four door bronco) to have dual tanks of 35 and 40 gallon tank but i think that was a special order from the conversion company
19 Gallons.
aaround 14..
20+
http://www.fueleconomy.gov/Feg/noframes/24629.shtml
The 2014 Chevrolet Tahoe SUV has a manufacturer's suggested retail price of $60,840. Its fuel tank capacity is 26 gallons.
The fuel tank capacity of a 2000 Chevrolet Suburban SUV is 33 gallons. It has 285 horsepower, and can tow up to 9,000 pounds.
On average the size of a fuel tank on an SUV is usually around 23-30 gallons . The size of the tank will vary depending on the model. The 2012 Ford Escape Hybrid is considered to be the most fuel efficient.
The 2013 Cadillac Escalade SUV has a gas tank capacity of 26 gallons. Its manufacturer's suggested retail price started at $63,745.
It's a 21 gallon size tank. Although it's design has to compensate for the fumes and air swashing inside and it'll only realistically fill up to 18 - 19 gallons of fuel.
The 1998 Kia Sportage SUV has a 15.8 gallon fuel tank capacity. It gets 17 miles per gallon in the city, and 21 miles per gallon on the highway.
A 2017 Audi Q7 SUV fuel tank capacity is 22.5 US gallons.
23-30 gallons