A few months ago bio fuels was the big buzz word. With what experience I have repairing vehicles for over 30 years and what I've read I have come to the conclusion that bio diesel is the best, simplest and cheapest way to go. That said why is it most everything you read about is pushing etanol. Also why is it we're pushing a fuel that isn't a direct replacement for most existing vehicles where bio diesel is a direct replacement with no added expense. Also why is it there are less diesel powered fuel efficient vehicles being sold now than before?