Considering there are 23/26 gallon tanks, and 36 gallon tanks, you can't squeeze 33 gallons in either of the lower tanks, so you have to have the 36 gallon tank. The trip computers are never right, and they don't list gallons used anymore either. You can run it out of gas and find out, just carry a 5 gallon can with and know where your emergency fill nozzle it located.

 

Just a quick FYI. I once rented a Focus and when the DTE said 17 km to empty it ran out of gas on the 401. All highway driving. Just be careful when you try it for the first time.

 

30 gals X 15 = 450miles. Your DTE is guestimating 490. Seems pretty obvious you have a 36 gal tank.

Sorry, but only an idiot would try and run himself out of gas, for any reason.