I disagree with the passanger difference. .5 seconds for ~150 lb person? No WAY! With a really light car, maybe...but I'll still doubt it. Ive ridden with good National drivers in Miatas, and they've thrown down their fastest runs with my 200 lbs in the car.

FWIW, CRXs are in G-stock....and they are STILL slower than F-stock.

To accord95vtec, Autocross is driver and course dependent more than anything else.