Days after the Porsche 918 Spyder Hybrid Supercar concept hit the Geneva Motor Show, 900 people have already promised to buy one. Porsche says that if 1,000 potential buyers show serious interest in the 918, it will approve the production of the hybrid supercar, according to Autoweek.  With just 100 pre-orders to go, things are looking good for the hybrid supercar.

The 918 Spyder concept has 680-hp and will get 78-mpg, according to Porsche. The hybrid supercar is expected to have a 0-to-60 time of 3 seconds.

The 918 Spyder is Porsche‘s answer to increasingly strict rules on emissions and gasoline consumption for production cars worldwide. Since Porsche specializes in high performance vehicles, following those rules takes a little more thought than just focusing on smaller cars. Porsche cars aren’t built for A-to-B drivers. Everyone who buys a Porsche could easily afford something more practical, so stripping down a Boxster to something resembling the Lotus Elise and getting its gas mileage over 35-mpg would result in a frugal car, but nobody would want to buy it.

That’s also why Porsche has to start at the top of its lineup with hybrid technology. If the Boxster or Cayenne were the first cars offered in hybrid form, buyers would see it as a weak attempt to meet fuel economy standards, and the cars wouldn’t sell. But if the 918 Spyder and the 911 are already offered with high-performance hybrids, when the baby Porsche (Boxster) and the mommy Porsche (Cayenne) add hybrid models, buyers will jump on them.