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I've never heard of anything offering those kind of gains except for 20 bucks on ebay..Stay away. My mileage is horrible on my sierra 11.6 MPG. I'll be ordering a Hypertech Max Energy Programmer today because it comes with a 30 day money back guarantee. I'm looking for mileage increase of around 2 mpg. Because over the life of the vehicle I'll save thousands. A new intake would help out in the mpg area and you can find them on ebay for 200-250.
Your mileage will increase and the engine gets broken in. So I'd say hold off for a couple months. I'll be writing a reveiw of the hypertech to see how it works. Hope this helps.
 
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