That is down to the amount of late night curfews Santa Pod is allowed a year by the council.
If you go to a FIA Drag Racing event they can race till 9pm as thats when the Pod use the curfews due to the noise of the cars.
I prefer it that way since we race a Dragster and it means we get more track time.
Jet Car gets boring after a while anyway...give me piston power anyday.