Looking at Table 2.12 from the recently released Transportation Energy Data Book, it would appear that van pooling with an average of 6.1 passengers per van offers the most energy efficient mode of transportation. With 1,322 Btu per passenger mile, it even beats motorcycles at 1,855 Btu per passenger mile. Cars with an average load factor of 1.57 persons per vehicle use 3,512 Btu per passenger mile, while transit buses are surprisingly high at 4,235 Btu per passenger mile because of their relatively low average load factor of 8.8 persons per vehicle. For people in suburbs wanting to save money on gasoline, it appears that van pooling is the most economical and efficient way to save energy and help the environment, but it does also require a life style change.