They seemed to be focused on looks with no substance from the start. This can't be too surprising to most folks. I'm just dreading all the fodder this will create.

So does anyone know what happened to the "big announcement" which was supposed to happen on Thursday? Of course the right is screaming he tweeted just to bump up the stock price - but I have to admit the deafening silence is very weird. Elon should have at least just made something up... flying cars?

I understand the sentiment and in fact sold my diesel for an electric; but there are many diesels on the road today which obviously won't be thrown in the trash anytime soon. Biodiesel is already widely available at a reasonable price - Extreme Biodiesel sells it for about .20 cheaper than regular diesel- and you get the range some people require. As John points out though, automakers are concerned over mixes above 5-10% because that's where some fuel filter and fuel pump seal materials start to swell, or you can see crystals form below 30F (clogging the fuel system).

You mentioned that recycled cooking grease is one definition of biodiesel, but it's not, and many people have that misconception. Biodiesel is diesel fuel which has been created using vegetable oil rather than petroleum - you can put it right in your diesel car without modification and it'll run fine. BUT there are things to watch out for; biodiesel is a very strong solvent which will destroy any natural rubber hoses or seals in old model cars (those must be replaced with Viton synthetic rubber). Waste oil can only be run in cars which have heaters retrofitted on the injectors, because the waste oil won't properly aerosolize if it's too cold, leaving deposits (eventually leading to a seized engine).

I ran an old Mercedes on 100% biodiesel for 3 years and loved it. Lots of companies are making biodiesel, and the coop I bought it from converts used cooking oil from chains like Taco Bell (so no farmland is traded for fuel use, and the waste oil doesn't hit the landfill). Solazyme has been working on their very expensive process for many years- I'm curious if they've got it to be cheap enough yet.

It'll be good to have another option in the market, but I can't see why you'd spend that much money for an i8 when a Tesla S performance pack gives you better acceleration, more usable space; and you're not tied to the gas pump. Maybe it's just me, but 20 miles electric range is lame (especially compared to 240).

Oh and don't forget the fade-away retracting door handles. Way cool

The metallic green looks great in person, and would definitely be my choice too. Pictures for some reason just don't show the cool lines of the S. The back end looks like a Maserati, wide and aggressive; and the front hood has subtle ridges which strengthen it and direct airflow past the mirrors to reduce noise. Congrats!

I live in hotter Southern California and have lost a battery bar due to the 110F+ summers that are becoming the norm, translating to about 10 miles lost range at 25,000 miles. Hopefully this summer doesn't reduce it further. The Nissan iphone app is pretty lousy, but if you force it to quit it'll log in quickly the next time (double-click button, hold icon on bottom until a "-" appears, then kill it). Lastly, I've found PlugShare to be a far better app for station location (in my area at least) because it's updated by users for users. Thanks for the update.

Hardly a failed venture considering Tesla created the S from the ground up, going from prototype introduction to delivered cars in 3 years. And winning -
Automobile Magazine's 2013 Car of the Year
Motor Trend's 2013 Car of the Year, and awards given by Time Magazine, CNET, Popular Science, Yahoo Autos, Green Car Reports, AutoGuide.com