The tapering tail is no secret among scientists for improving stability and fuel efficiency. Many high-mileage concept cars feature just such a design to smooth the aerodynamics of the vehicle. Now imagine applying the same concept to container trucks that log more miles in a year than most of us travel in five.

A Dutch public-private enterprise did just that, adding a 6 foot long tail to the end of a tractor trailer truck. The results from two years of testing were a 7.5% increase in fuel efficiency, and thus a similar decrease in emissions.

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With the world focused on fuel economy, advanced car design seems to be converging around one point in space. And I do mean, literally, a point in space — a point sometimes seen flying over Roswell, or crashing in the Bermuda triangle.

Regardless of what you think about this type of design, it begs the question: do cars need to look like alien spacecraft to get decent fuel economy?

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Aptera also plans to use the new funds to construct a manufacturing facility in Vista, CA, close to the company’s present headquarters in Carlsbad.

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Teams from around the world are gearing up for the Automotive X Prize, a competition that will award part of $10 million to the team that builds the cleanest production-ready 100 MPGe (mile per gallon equivalent) vehicle.

This isn’t a race centered on space-age concept cars that will never see a US highway, but aims to jump-start the auto industry with revolutionary, super-efficient vehicles that consumers will actually want to buy. Entries must be ready for production and have a business plan outlining how they’ll be brought to market. They’ll also be judged on safety, cost, and features.

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[UPDATE 9/15/09]: Volkswagen’s Diesel-Hybrid L1 Concept Gets 170 MPG, Available by 2013

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This is what a team of engineers can do when challenged to push the limits of fuel efficiency and technology. You may have already heard of VW’s 1-liter car, but take a closer look. It’s a sports-economy concept car produced a few years ago by VW engineers, to answer one big question: could they build a car that consumes less than 3 liters of fuel for every 100 km traveled?

It turns out they could, but they didn’t stop there. Instead, VW blew by that goal to create a car that uses only 1 liter of fuel for every 100 km. That’s 285 MPG.

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For under $30,000, you will soon be able to buy an electric car with a 120 mile range, or a plug-in hybrid that gets 300 miles-per-gallon.

Sound like a fantasy, but this one could be coming to a dealer near you. Slated for release in late 2008, the company Aptera will be offering the initial limited release of their fully electric model Aptera Typ1, and the 300 mpg plug-in will follow in 2009.

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