There is no way to make the same engine produce the same power and yet decrease the fuel used via gas management. If you reduce the fuel, you are going to loose power. The computer may cut the flow for cruizing and then kick it back up for needed acceleration and do it better than the OEM computer but 22% better, I seriously doubt that unless it cuts the HP by the same amount.
You could put on a turbo or supercharger and reduce fuel requirements while increasing power but just managing the fuel delivery, very unlikely.