I like my ScanGauge. It displays four values on the screen at once, and at the push of easily-accessible buttons which are located at each of the screens on the front of the instrument, I can instantly select other values I want at any time. It's very simple and intuitive to do.
And the ScanGauge is so small it fits just about anywhere in the small instrument display area on my car.
Relative to my fuel economy performance, the average MPG values shown on the ScanGauge are very reliable, and the results are within a percent or two of what I hand-calculate at each fill-up.
The instantaneous MPG value is a big help in guiding my throttle control methodology to squeeze out as many miles as I can from each increasingly costly gallon.
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