The owner's manual says the fuel capacity is 14.5 gallons (you may be able to get more or less of course, depending on the gas pump you use to fill it up and if you try to top it off).

I've been very curious about this as well since the Low Fuel warning really annoys me. I've had several cases where I monitor it closely and when the last bar on the gauge disappears, I set the Trip B odometer. Then when I fill up, I subtract from 14.5 and based upon my average MPG, estimate how much was left in the tank.

In all cases, it has always come to 1.5 gallons when the last bar disappears from the gauge. So however far you can go on that, with some caution for hills and other things is up to you.

 

Sorry for the offtopic, can someone tell me if is normal to have air pressure in fuel tank?
It releases air pressure when I open it. It might be normal but I didn't notice it on other cars I driven.

 

same issue here

 

such a fun car to drive, but such a small tank (given the gas mileage)

 

I drive a 2013 MR and personally, I get about 185-200 miles per tank. The tank size is about right. Coming from a IS250, the Evo has basically the same fuel economy (I know it sounds stupid but bear with me). I would refuel my IS every 240-260 miles or so. The thing is tho, the IS has a 18 gallon tank, and I would always fill it up around 16 gallons. If the evo was equipped with a similar tank, we would refill our cars at about the same rate as the IS. My point is, the problem with the car is the small tank. As long as you keep your foot off of it, you should get decent mpg's (I get 15-17 city and 23-25 hwy)