how many litre is the gas tank

your tank capacity is 88 liters. if you are asking about the "age" of gasoline, most fuel is safe up to four months. after that, gasoline begins to decay and smells more like paint thinner than gasoline. long-term storage of anything with gasoline is risky as you are likely to damage the fuel injection system unless you add a stabilizer (STA-BIL) to your gas tank.