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SG2 is invaluable. I cant really put a price on how much its helped me. I would say the SG2 Conservative has helped me 3-5MPG.
one more piece of info if you ave a scion xb is: if your still running the stock tires you have multiply our mpg by 1.03 - cause the speedo is calibrated for the stock bB sized tires of 185/65/15 instead of the 185/60/15s that come stock. I found this on scionlife.com Hope it helps
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