With everything else stay the same (you will drive the same way you are driving now), you may see an increase in gas mileage (a little). But speaking based on experience, you won't see any increase because back in your head you know that you have more power now, you tend to grow a lead right foot, and stomp of the throttle more frequently.
One thing that I would caution you though, by adding performance parts, it may void your warranty. So, check with your friendly local Toyota dealership before you install performance enhancer that is not easily removed (eg: catback exhaust, or even cold air intake), should you need to send the vehicle back to the dealership for service.
Tuesday, December 2nd, 2008 AT 11:34 PM