That's still not particularly efficient. There's still variable load: circuit work, obstacles to climb over, flying around (or into) airspace. Air density isn't

That's still not particularly efficient. There's still variable load: circuit work, obstacles to climb over, flying around (or into) airspace. Air density isn't fixed, your engine may be running richer or leaner than you need to be. Pilots aren't nearly as efficient as setting the mixture as a computer, nor are the currently used single injector (or carburetor) as efficient as multi-point, or direct, fuel injection. GAMI got their start selling more balanced fuel injectors, but there's only so much you can do when you squirt gas into a tube and hope that it makes it equally to all cylinders. There's a _lot_ on the table in terms of efficiency and it puzzles me why there has been almost zero progress on this front.