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Reducing the flywheel weight sounds good at first blush, but it will quickly change the driveabilty of your car. Flywheels store inertia, very important for leaving from a stand-still. If you have too little stored inertia, starts become jerky so you need to rev the engine higher before letting out the clutch. Then your driving style needs to change, you slip the clutch more and you wear your clutch out more quickly as a result. There is this "Goldie Locks Zone" for flywheel weight, I'm not sure but a heavier one might actually help a hypermiler.
Drums, rotors, and wheels and tires on the other hand, are low hanging fruit. Particularly the wheels and tires. Any reduction in wheel assembly inertia makes the car accelerate easier, brake quicker. Reduction in any unsprung weight helps the suspension work better.
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