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I have run performance chips in other Toyota vehicles and agree with the negative posted comments. Any chip or piggy-back module that improves gas mileage is simply leaning out the air fuel mixture. A potentially hazardous condition. Having said that, I do run a Sprint Booster which improves acceleration without changing the AFR. It overrides the stock software which Toyota purposely designed to delay acceleration to achieve higher MPG ratings in city driving. In stop-and-go traffic I can disable the device, returning to the stock software. The Sprint Booster will give you noticeably faster acceleration but does not increase HP and your MPG will decline if you're always putting your foot in it.

If you're dead set on a module check out "Unichip". They have been making chips for Toyota's for many years.
 
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