I get about 300 miles to the tank (not that the "almost empty" light is on, but when I get to around 300 miles I fill up and I am close to empty). The US model holds 22 gallons - I'm not sure about the JDM. I think I last calculated around 16 mpg (US gallons). The supercharger and a lead foot keeps me from getting much better mileage-wise.

-- John