If you can travel around the map without using the Tranzit Bus you will unlock the Fuel Efficient achievement.

Notice the street lights along the roads - some will be turned on while others are not.

The street lights that have a green glow teleport you to various parts of the map depending on which street lights are green.

To enable the green street light teleportation you must have a Denizens creature attacking you, walk under the green street light slicing it and it should jump off.

The Denizens will dig a hole directly under the light, jump into the swirling hole it creates and you will teleport instantly to another location depending on which green light is enabled elsewhere.

This can be done as many times as long as the light is enabled green.