I reliably get 500Ks to a tank, running slightly lean at top end.
I may or may not have had over power/wieght cars 2 out of 3 years on Ps. I regularly go down to and through the Knox area. Just paid 25% less on my license renewal because I have never lost a point.
I'll be off my Ps in Jan and the car is getting tickled to around 250rwkw about the same time.