Car Review Maximizing Fuel Economic Scheme - Windows, A/C, Heat?

Will you lot instruct amend gas mileage amongst your windows downwards or amongst the A/C on? How does this compare to windows up, or amongst the estrus on? At lower speeds, it volition last to a greater extent than efficient to lower your windows. At higher speeds, where drag increases exponentially, the drag created from having your windows downwards volition convey a higher deport on on your efficiency, as well as hence it volition last amend to campaign amongst the windows upwards as well as the A/C on. But what speed does this tumble out at? Let's run approximately tests to honour out.