I find it very annoying to listen to my coworkers whine about the cost of gasoline, yet they drive large vehicles inefficiently, often speeding or accelerating very quickly from a traffic signal to just brake hard at the next light.

A common rule for defensive driving is to make sure you have a getaway by not traveling directly next to a car going the same speed. Also, the implication is that all cars are starting on the roadway at the same time and acceleration, and one has turn signals.