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Perhaps non-obvious, but the ScanGauge readout I find most useful is coolant temperature. With the Insight, at least, the built-in temperature gauge is worthless. (Shows 5 bars at about 140F, and maybe 6 driving up a long mountain on a hot day.) In colder weather, the engine hardly ever gets to normal operating temperature without a radiator block, so is operating at less than best efficiency. So looking at an accurate coolant temp tells me it's time to put in a larger or smaller block.
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