Now that tells me batteries, in general, are better in warmer climates and diminish the further north or indeed south in colder southern hemisphere countries. So our batteries will need replacing at a cost due to more frequent charging. Whilst a good idea, in theory, you will, in fact, use more energy to drive the 15 years of Criminal Minds 2005-2020 thank you for the memories shirt car forward than you will capture. Drag, friction, etc. Perpetual motion doesn’t exist. EVs and hybrids recover energy via the brakes. Fans in ducts on moving vehicles create drag and wouldn’t generate enough electricity to overcome it let alone power the whole vehicle.