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It's probably your cars.
In all cars I've had my SGII in, I've been able to hold my instantaneous MPG dead steady in steady driving.
However, just about every car I've tried (especially newer cars), there's some compatibility issue with SGII or UG or whatever. It seems as cars get more complex, on size fit all gauges are more difficult to program.
Fluctuating MPG could also mean a bad MAF sensor.
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