The INFINITI M56's gas tank is 20.0 gallons.
Larger sized gas tanks are advantageous because you don't need to go to the gas station as often. Also, you can take advantage of days when gas prices are discounted and fill up your vehicle with a larger quantity of gas.
Scroll down for the gas tank size tables for your year and trim.
|2013||Sedan 4D V8||5.6L||20.0||75.7|
|2013||Sedan 4D x AWD V8||5.6L||20.0||75.7|
|2012||V8 Sedan 4D||5.6L||20.0||75.7|
|2012||V8 Sedan 4D x AWD||5.6L||20.0||75.7|
|2011||V8 Sedan 4D||5.6L||20.0||75.7|
|2011||V8 Sedan 4D x AWD||5.6L||20.0||75.7|
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Also, you can consult the vehicle's owner's manual.