The biggest determinant of vehicle energy use is the driver's behaviour. The technological factors—the weight and the other systems on the vehicle—are secondary to the driver's behaviour.
The behaviour of drivers is also the greatest determinant of road safety. It's how people conduct themselves on the road—how fast they go, where they go, when they go, what kind of shape they're in when they start driving and continue to drive, and so on.
As you very correctly pointed out, Monsieur Coderre, that is an educational process. I think there's also a role for the law enforcement agencies. Graduated licences are a key factor. If you have young people in your home, they just can't drive anywhere they want, the way we used to when you and I learned to drive: once you had your piece of paper, you were on the go. It's just not that simple any more. I think that's a good thing.
The education and regulation and enforcement environment in Canada is improving towards mitigating the poor effects of poor driving practices. There is certainly a role for technology as well.