The total tank capacity is 15l and the reserve capacity is 3.2l as you have mentioned. The fuel gauge would show only 11.8 litres. However, below the’Empty’ mark is the reserve of which the whole 3.2l is usable. Thus, P150 has total capacity of 15l but the P180 has capacity of 18l. Realy nice and smart I love pulsar150. Super bike hight & wheit perfect ferments good, its reminds me of class, Superb bike Compared to other 150cc bikes. bike fule consumption is impressive.on road biking experience is really-good. pulsar give you comfort because its riding style handling and control is best in the class. most reliability in its segment. I will give 100 points for its looks.