gizmag reports on The first commercially-available diesel motorcycle but there's no mention of mileage, which is disappointing. But the fact the things can run on vegetable oil is pretty astounding.
If I didn't have to sacrifice quickness and agility, I'd consider replacing my bike with a diesel. Why not? I'll also go for an electric bike when it can go a hundred miles or so without needing a charge and can go 0-60 in around 3.5, like my current bike.
