A large percentage of the population uses cruise control, probably without realizing that it's the single easiest thing you can do to increase your (freeway) mpg.
It's also apparently pretty common for hybrid-car drivers to adjust driving patterns to improve mpg, partly because the car gives rapid feedback - gamification in real life! - but there's probably also some selection bias, as people who buy high-mpg vehicles are more likely to be concerned about fuel efficiency.
It's also apparently pretty common for hybrid-car drivers to adjust driving patterns to improve mpg, partly because the car gives rapid feedback - gamification in real life! - but there's probably also some selection bias, as people who buy high-mpg vehicles are more likely to be concerned about fuel efficiency.