Doesn?t affect gas mileage and is silent. This computer is a renewed product, but I would never have guessed by looking at it or using it. Some members of its crew were sadly betrayed by quislings and then mercilessly shot in the back in a French field by the Nazis where a memorial has since been erected. The wire is thinner, feels more brittle and tangles easier. I have had mine for ~ 1 month now with ~ 15 hours of use. I don?t plan on pulling them down so they are permanently super glued onto mine because I don?t want to see the screws. Great as a moisturizer. Just as good as a parrot headset at a quarter of the price They are so comfortable and offer great support. Headpiece is adjustable for any size.