Your 475 hp car is the same one you drive in the 60s with the same corroborator? Or is is a new car designed to use unleaded. My 289 TVR Griffith got 27 mpg in the 60s on leaded, even going to the drags and driving over 100 mph. Wiped several 429 Cobras in street racing.
First, I would like to congratulate you on surviving your time with the TVR!
As to the 429 Cobra I am guessing you are referring to the 427 Shelby Cobra which had a better power/weight ratio than the TVR and a good second better time in the quarter mile than even the 271 HIPO TVR. You may have surprised a couple but no way did you ‘wipe’ them.
My car is a 2016.