There's a new 'Anmphicar' type which was designed by a Kiwi and I think built in UK which goes well in both environments, even planes in the water, unlike the original. Not bad looking either.

I've always thought that the fuel of the future is alcohol made from biomass. It has a reasonable calorific value and a lot of the technology is already around. Brazil use to mix it with their petrol.

The alcohol in methelated spirits here is mostly made from Whey, a by-product of cheese-making. This may give new insight into why Little Miss Muffet keeps seeing spiders.
Is Meths what is termed in the US 'denatured alcohol? I've read the words but not seen the product.