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My SGII does pretty well once it's calibrated over a few tank fulls(850 plus miles) and driven under the same conditions every time. For instance, if my in town driving is calibrated correctly, then my Hwy reported MPG's are way off, and reported as frusteratingly low. I use mine for refference only, and rely on hand MPG calculation/ fully venting for accuracy.
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 2002 VW Jetta TDI 5-speed(completed 01M-5-speed swap at 155K miles) 45 MPG City with the 01M, 5-speed 60+ MPG City. Nokian Entyre Low RR Tires. Experimenting with the "Hybrid" 205 Deg F T-stat:
http://forums.tdiclub.com/showthread...=306799&page=4
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