[christofoo]

Add my $0.02 on the skeptical side (at least concerning the 'greenness' of the orange oil). Until Yokohama defines how much of the petroleum oil has been displaced by orange oil, and accounts for the energy required to extract the orange oil (and if only there was a certification for it), it might as well be snake oil, at least in terms of green production.

I can't even find the patent. Anyone?

I've read too many plugs like "vinegar is the greenest cleaner and disinfectant". (Hint: muriatic acid = vinegar x 100, but mostly just for cleaning hard water deposits.)