Very nice. Back then, Esso (Canada) and Exxon (USA) offered a little tiger tail, which some people attached to their car's gas cap...as the company's slogan back then was you could put a tiger in your tank if you used Esso/Exxon gasoline.
My favourite Pontiac GTO was the first, the 1964 model. I saw one, ahead of us (naturally
) on the Dan Ryan Freeway, in Chicago during Easter holidays in 1964, I believe.
Loved the taillights at night, although I only got a quick glance as they disappeared quickly, as we followed the GTO in our family '61 Chevy Nomad.