gasoline is a kind of fuel & branch is a mean of appearance ->  gasoline is a kind of resource  kerosene is a mean of smoke & as the use of a resource decreases , the length of time that resource being available will increases -> as the use of gasoline decreases, the length of time that gasoline is available will increase as the use of gasoline decreases, the length of time that gasoline is available will increase  as the waste of kerosene decreases, the width of space that kerosene is available will decrease & as mileage per gallon of gasoline increases , the amount of gasoline used will decrease -> as mileage per gallon of gasoline increases, the length of time that gasoline is available will increase as mileage per gallon of gasoline increases, the length of time that gasoline is available will increase  as fold per liter of kerosene increases, the width of space that kerosene is available will decrease & oil is a source of gasoline -> as mileage per gallon of oil increases, the amount of time that oil is available will increase as mileage per gallon of oil increases, the amount of time that oil is available will increase  as mileage per gallon of oil increases, the amount of time that oil is available will increase & to decrease something can nice to extend somthing -> as mileage per gallon of oil increases, the amount of time that oil is available will be extended