ive had my car for 12 years and the only time i get more than 320-350 is when i am freeway driving... and the car is services as if it was a Ferrari...

a lot of it has got to do with your right foot... mine is rarely used (over the last 5 years anyway), and when it is it get only a few moments of vtec.... dunno, im not too worried about it, but its always been that way for me