It depends on what type of car and what gear you are in
Your car or vehicle is in neutral, or the clutch is shot.
600 to 1000 revolutions per minute (RPMs) is the typical average for idle.
the car probly has a limiter which won't allow you to top the car out
that would be good for the cold idle and should drop three times as the car warms up and should idle about 650 to 800 auto trans
Check the timing and check that the cable to the accelerator is adjusted correctly.
Depends what the Hennessey does to it. It has upwards of 1000 HP @ 5000 RPMS and 1100 foot lbs of torque @ 3500 RPMS
A car that travels 1000 kilometers in 5 hrs, averages 200km/h.
see what the rpms are at. The vehical may have a govener at a certain speed or or rpm
1000/10 kph
maybe your rpms gauge is broken.get it looked at by a professional
It would most likely be a pluged catilitic converter
watch the rpms when you break stand the car