Changes

[[File:Gas-price.jpg|thumb|380px|trends in pump price in USA, in 2009 dollars]]

[[File:Gas-price.jpg|thumb|380px|trends in pump price in USA, in 2009 dollars]]

Some stations also sell diesel gasoline, especially for large trucks. Diesel engines are more efficient, but are cumbersome (for example, they are hard to start).  

Some stations also sell diesel fuel, especially for large trucks. Diesel engines are more efficient, but are cumbersome (for example, they are hard to start).  

In the 1950s, gas stations were full service.  The trend that spread from the 1970s was towards self-service, which is the most common type today.  There are still pockets on the east coast that are mostly full service.

In the 1950s, gas stations were full service.  The trend that spread from the 1970s was towards self-service, which is the most common type today.  There are still pockets on the east coast that are mostly full service.