Simple observation quickly shows many people are clueless to the effect of their driving styles on their fuel economy as well. Full throttle rush towards the next red light, slam on brakes, stop....repeat. Highway driving? Absolutely positive HAVE to achieve that 10 foot gain on the guy beside you, even if it means changing lanes and mashing on the accelerator only to inevitably end up following another car and having to slow down. Again, repeat....over and over and over again.
Simple driving style changes can yield the average driver a HUGE increase in fuel mileage, but until the "I'm more important than everybody else, I need to be in front of you and get there as fast as humanly possible, screw you all" attitude of many of todays drivers change, all the technology advances in the world won't help if the idiots behind the wheel just continue to operate the vehicles in a basically inefficient fashion.