Gas mileage was lower than usual with these bars and the box mounted but that was to be expected. I got these after returning a different brand that had poor sound quality. Benefits outweigh the negatives. I have worn these for years, I was very hesitant spending so much on a pair of sandals, but decided to take a chance. I bought these slippers for the hospital stay after my c-section. Negativ: Drehregler für analoge Sendersuche viel zu knapp neben Lautstärkeregler - Abhilfe: Abkleben. So I found some crocs here on Amazon and after I did the research from the reviews decided I would try them. When listening to a song by a band that has a great guitarist, bassist, and drummer, you can clearly distinguish between the players on these speakers. I?ve owned these for two years and have used them for an average of 8hrs a day everyday doing construction, they?ve been abused and they still keep on chugging. Excellent craftsmanship and beautiful color.