I wrote in asking about tires a while back. I decided to put the" Firestone Firehawk Wide Ovals"
on my 1989 Convertable. I have put about 1500 miles on them and love them! Vastly improved my ride and took it up to 137 mph yesterday on quite Montana road. Vette felt good and had a lot more left in it. I will take it up higher when I can find a better road!

 

I've noticed the same with my '87 work-in-progress. I run out of highway before pedal

I hope you do the same thing I do and run the road at a normal speed first, memorizing every little nuance, bump etc... Then run it at full throttle[8D]