Why doesn't Ferrari put a more fuel efficient engine in it, and then wih a nudge nudge, wink wink, have the owner replace it with a more powerful, but less fuel efficient, engine? The type of person that will buy a Ferrari will be able to afford to replace the engine or have aftermarket tuning done. Ferrari is allowed to tell you how to turn it into a gas guzzler, they just can't sell it to you as such. They could even release the source code for the engine computer. It's the owners problem if they blow up their engine, and the engine computer should have no control over steering and brakes.