Over the last ten years, the increase in gains in mileage have not been through major technological break throughs in the mechanics of the internal combustion motor. It has been instead, a direct result of the integration of the computer as a management tool for the entire automobile. . It has in function combined all functions from the sound system to the transmission under one umbrella and now makes decisions to optimize all the functions in ways that prior to now, we’re impossible by mechanical means alone.
Nothing else you add to a car on your owned that wasn’t programed in as a Variable the computer can’t manipulate is of much good; not even, Global Emergy devices.