Is Mazda 6 fuel efficient?

In the fuel tank

22-24 mpg avg, 19 low, 28 high. I've had a V6, 2005 model year Mazda 6 sport wagon (storm blue, if that matters) for about 2 and a half years. I've kept every single gasoline receipt, and monitor my...

You can not drain all the gas out, there will bee spillage.

It is built into the fuel pump. If you have the know-how and the tools, you can do it yourself. If you've never performed this type of task... take it to a shop.

18.0 Gallons, per the owner's manual. Fuel tank capacity is the same for the i (4 cyl.) and s (6 cyl.) models.