Small Accumulator Hybrid

Ford would do well to offer a small "Accumulator" hybrid system to increase fuel mileage in nearly all vehicles.  The accumulator (Compress nitrogen or dried air over hydrawlic) would boost the initial movement from a stop and let the engine work more in the sweet spot of the power curve as it is helped by the accumulator in the initial power requirement to get the car moving.  If Ford mass produced this accumulator hybrid system it would not cost much and certainly not cost as much a battery/electric hybrids.  The accumulator could be combined with start/stop engine technology to further enhance fuel mileage.  This system would clearly give Ford a lot of Green cred as the Greenest Car Company!.