Nope, regen energy is merely energy recovered that was originally supplied by gasoline or the charged battery. Without regen, it would have been lost as heat.Seems to me that if you disable the Volt’s regenerative braking system and rely on the friction brakes, you will reduce the Volt’s total trip range without reducing the amount of grid electricity and gas used. That would seem to indicate that regen provides additional range and should be included as fuel used to drive the recorded distances when calculating fuel mileage.
However, electric miles driven using regen battery power (created while driving in Extended Range Mode) and gas miles driven using gas when the engine is running are combined in the single Gas Miles category (= distances driven not using grid electricity or regen created while driving on grid electricity). We have no method of including the regen as fuel consumed when calculating the Volt’s gas mileage.