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Old 06-07-2018, 11:35 AM   #11 (permalink)
Cyborg ECU
 
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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)
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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.

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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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Old 06-07-2018, 01:16 PM   #12 (permalink)
EcoModding Lurker
 
Join Date: Mar 2018
Location: North Covington, WA
Posts: 8

98 Civic EX - '98 Honda Civic EX
90 day: 27.12 mpg (US)

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Correct. No two days will be identical in driving conditions.

However if one looks at a history of data, one can see a trend.
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Old 06-07-2018, 03:27 PM   #13 (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 2,164 Times in 1,466 Posts
As far as fuel economy goes, your car appears to be operating more or less to spec for an automatic '98 Civic EX. Congrats, you fixed it! If you don't want to consider hypermile techniques & don't want to mod it, you are basically where you will be in terms of fuel economy. Enjoy your car, man.
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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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Old 06-07-2018, 03:53 PM   #14 (permalink)
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Join Date: Mar 2018
Location: North Covington, WA
Posts: 8

98 Civic EX - '98 Honda Civic EX
90 day: 27.12 mpg (US)

08 Legacy SpecB - '08 Legacy GT SpecB
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I guess I'll just try to forget that it did get ~32 MPG.
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Old 06-07-2018, 11:57 PM   #15 (permalink)
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Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,747

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
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Was your timing advanced or retarded before you set it properly? Advanced might explain it. (I'm rather surprised that Honda was still using a distributor in '98)
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Old 06-08-2018, 04:34 AM   #16 (permalink)
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Join Date: Mar 2018
Location: North Covington, WA
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98 Civic EX - '98 Honda Civic EX
90 day: 27.12 mpg (US)

08 Legacy SpecB - '08 Legacy GT SpecB
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Quote:
Originally Posted by Stubby79 View Post
Was your timing advanced or retarded before you set it properly? Advanced might explain it. (I'm rather surprised that Honda was still using a distributor in '98)
Trust me, I was also surprised that Honda was still using distributers in 98! I even had a discussion about changing the timing at the local stealership with a service writer who didn't believe me.

Sorry, but I don't recall was the timing was at when I adjusted it.

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