Thanks, BZP.
You have good taste BTW. The fastback 'Vette is my favorite of all model years. The short-lived 80's TV show
Stingray had me drooling for a jet black '65 which also just happens to be my birth year.
Back on topic, my brain has "practical" lobes that keep me from investing too much. A good DIY cap could cost hundreds to do right and look sharp. The fuel savings payback is there but takes years. (shrug)