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Old 06-07-2018, 11:35 AM   #11 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,297

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
Thanked 2,162 Times in 1,465 Posts
I realize you feel you are driving it the same way as before. We have all been there. But without good gauges to monitor average speed, throttle position, engine load %, and other factors and without a clear indication of how you did your fueling each time there are simply far too many variables. Further variables: average daily temperatures affects fuel economy. Imperceptible changes in foot position can have significant impact on engine load. Small changes in average speed can adversely affect average fuel economy. Put a few of these together and you can rather easily account for your drop in FE--even though you feel like everything was the same. If you want to see for yourself, buy a fuel economy gauge for your OBD2 port, such as an UltraGauge or a ScanGauge. Buying one of those might be the best money you invest. Used well, you will get its cost back after a few tanks.

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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