Bob, My understanding is that those very high pressures result in super fine atomizing of the fuel and super precise timing of that injection into each cylinder. The pumps and injectors are out of this world. When combined with turbo charging, current diesels are getting more power per swept volume than a good gas engine was 20 years ago. And more torque than a V8 Chevy. Impressive stuff compared to the Toyota 2h diesels I am more familiar with.