What is the fastest car *in reverse*?

[GleepGlop]

What is the fastest car when driving backwards? I saw a thread about the GT by Citroen concept driving backwards really fast because it is an electric with a single gear or something.

 

[HBR-Roadhog]

I tend to drive them all about the same speed on the reverse tracks and on the normal ones

The Tesla is a single gear as well. But really who cares how fast they go backwards. I want to go forwards wherever possible.