Carbon-neutral gasoline? Sounds good to us.

Internal combustion may be yestercentury's technology, but cars and trucks running on dinosaur juice will continue prowling the world's roadways for decades to come -- though they may get a lot cleaner in the coming years. Porsche, along with a constellation of partners, is working to commercialize a carbon-neutral liquid fuel, which could be an environmental game-changer if scaled up.

Plainly named but patently cool, eFuel is a synthetic gasoline that burns exactly like the traditional stuff yet has minimal environmental impact. "We pursue eFuels as a complement [to electrics]," said Jan Ohmstedt, project manager for Porsche's eFuels project, at a media event. He explained this is an innovative way of cleaning up existing internal-combustion-powered vehicles before they eventually get replaced by cleaner electrics. eFuel could also be used to efficiently power classic cars, keeping our automotive heritage alive -- and sustainable -- well into the future. This point is particularly near and dear to Porsche, as around 70% of the cars it's ever built are still on the road.