Originally Posted by Focus YBTC
Or in other words with bigger heavier wheels you have four flywheels
by definition at each corner. A flywheel being a device that is used to store
rotational energy. Just be gentle getting them up to speed and your fuel economy will be quite fine.
This is incorrect, the rate you speed them up makes no difference. The amount of energy in them is a function of their rotational inertia and how fast they are spinning. How fast you get them to that rotation rate makes no difference.
Besides, the energy is lost when you hit the brakes.