I have a Coyote GT and don't miss the Mark one bit when I drive it.I pride myself on driving unique vehicles. I just came home from dinner in my 76 MarkIV. if you don't use that bottle and have the car jyst to enjoy it, I think you should keep it and replace your Mustang. Your car is exceptional and I think you will regret selling it. You will see a bunch of Mustangs if you go for a ride but I bet you won't pass another Mark.