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Old 06-04-2018, 11:14 PM   #6 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,219

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.37 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Originally Posted by oldtamiyaphile View Post
OBD gauges can't be relied on for this sort of testing.

An MPGuino, maybe.
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.

See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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