I would be in forth.

 

Same here.

 

Dont know dont care i just drive it,

 

This is categorically false.

Engines are most efficient at the lowest possible RPM and the widest possible throttle opening.

As for me, 6th gear by 35 MPH.

 

Pedal to the Metal...

 

Depends on how spirited I'm driving but 95% of the time I'd be in 4th at the speed.

 

When I hit the limit regardless if it's 60km/h or 100km/h, i cruise on 6th.. Isn't this normal?

 

4th if I'm on a flat surface, 3rd if there is an incline. I'll only shift into 5th if the RPM's reach 3400-3500 in 4th, otherwise I'll stay in fourth or lower depending on the incline.

 

My average speed on the streets is around 40mph so 4th gear is where I end up most of the time while cruising.

 

2001 S2000 Owner's Manual Recommended Shift Points
Drive in the highest gear that lets the engine run and accelerate smoothly. This will give you the best fuel economy and effective emissions control.
The following shift points are recommended: