OnStar will begin a service in June that can locate ethanol refueling stations for customers with E85-compatible flex-fuel vehicles. OnStar subscribers will first get an email detailing where E85 pumps are in their area and if they venture outside the comfort zone a quick push of OnStar’s blue button will dial up a representative who can help with directions. Inside Line is also reporting that OnStar is planning another new service that would let vehicle owners know when their tires are underinflated, a minor maintenance issue that can have a large negative impact on fuel economy.