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The more work you do the more energy is needed. Pulling a hill at fifty takes a great deal more energy than at thirty five. Also any time the engine is running the gas is flowing. As RPM increases the greater the piston speed and internal drag. There are lower engine speed efficiency limits as well so don't go too slow. Your instantaneous readings on your Scangage should reveal a great deal of information. Some cars have fuel shutoffs if the RPM is much above idle and the throttle position is zero so in this case shutting off the engine and riding the brakes might not be worth it wear and tear wise.
It's farly simple to create a graph and the killer app wil be when somebody makes a dynamic one for a flat panel to graphicly see how you're doing and what you should be doing for optimum economy.
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