w/o reading through the answers,
this is a pretty stupid poll, because it depends on too many conditions
How fast I drove would depend on:
a. amount of traffic
b. speed of other traffic
c. condition/type of car I was driving
d. how I felt at that time.
e. condition of the road (try the interstate near me... 65 will rattle your car apart)
Under ideal circumstances, I might do 90-95.