That's what I was about to say too. The technology is great and all, no doubt about that. But the complexity would make it very expensive. Add on to the fact that it doesn't improve gas mileage by very much, what's the point? Now if they can ge the gas mileage to be in the low to mid 30 MPG (comparable to a 1.6L engine), then it would be justified. But it's a good idea and a good start. Maybe in the future, they can shut down all cylinder except 1 when cruising. Now that would save alot of gas.