Truckers Choose Hydrogen Power
Think of it as a supercharger. It's driven off the engine, so it takes a percentage off --say 10%...I think that's about normal, but the compressed air that it feeds the engine gives the engine a 20-30% gain in power. Granted this is for fuel consumption, so it's not exactly the same, but same idea I think.
Some are saying that an alternator throws a lot of it's energy away. I always thought the higher the load on the alternator, the harder it would be to drive it, and when less load, easy to drive...maybe that's wrong.