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I haven't tested the SG2 much, but my dad has one on his truck. I have an UG and an MPGuino and I'm torn between them. The UG looks nice and seems to work well. However, the UG (as anything off the OBDII port) estimates gas milage based off the mass airflow sensor. When my car's in deceleration fuel-cutoff, the UG still shows fuel used (between 160-320MPG, but still). The MPGuino reads directly off an injector port so it assumes infinite MPG when that stops. I keep the MPGuino around for if I ever get around to doing real testing, since I can count on more exact values, but for day to day driving the UG meets my needs.
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