Keep your pressures up on your tires... I am running 32 lbs cold vs the stock 29 recommendation. Also and obviously the way you drive. I drive PCH over Malibu Cyn everyday to work. I've milked 420 out of a tank being a shylock with the throttle and this last week I pulled 375. I'm running all mobil 1 synthetics A to Z. Custom exhaust, Tornado(useless), my own custom intake (morgan-tec on Order!!)... I also put in premium in.