Actually, wood, being a renewable resource, is a different issue. The point I was trying to make is that you can't simply ignore the ecological cost of other solutions by saying that wood is a precious thing. Take recycled paper as another example - in the UK at least, paper is made from trees which are specifically planted ot be used in paper manufacture. If you don't make paper out of them, they don't plant the trees.

I don't think I've ever owned a car that dropped lower than 35 to the gallon and I've been driving since the 70s. Cars in Europe these days tend to do around 50-60 MPG.