Elon Musk has announced that Tesla Model Y vehicles built over the past few months have an extra 40 to 60 miles of range that can be unlocked.The additional range can be obtained by paying an extra $1,500 to $2,000, pending regulatory approvals.This is not the first time Tesla has offered increased range for an additional fee, as they previously did with the Model S.The decision to charge for unlocked range is becoming a trend in the auto industry as a means of generating revenue.