Quote:
Originally Posted by oldtamiyaphile
OBD gauges can't be relied on for this sort of testing.
An MPGuino, maybe.
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That depends on how precise a difference you need to measure. Properly calibrated, an OBD gauge certainly can tell the difference between 45 mpg and 50 mpg. My UltraGauge is consistenly within a single MPG, sometimes spot on, when compared with the pump. It is never wildly off by even 2 or 3 percent. For our purposes, OBD will work fine I think.