Related Clues:

• Quartet on a car
• Starts to disappear
• Car's quartet
• Gets less energy to contribute to enthusiasms
• Ones pumped up for a race?
• Yokohama or Hankook products
• Tricycle trio
• Becomes weary and in need of rest
• Tapering hairstyles
• Mailbox attachments
• Station wagon's wheels
• Loses stamina
• They may fly at half-mast
• Eases off the gas
• National symbols with stars and stripes