Dunia ka asan tareen method pta nhe kub logon ko smaj ayega. Jub reserve lge kilometers note ker lo phir 1 or 2 liter petrol dalo aur again reserve lgne pe kilometers note karo phir last reserve se abtak k reserve k kilometers ko jitna petrol dala ha devide ker lo for example 100km divided 2 liter petrol it means per liter 50 kmpl