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Old 06-13-2018, 09:26 AM   #1 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 4,888

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 60.87 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,710
Thanked 1,393 Times in 954 Posts
Great awful commute fuel economy

Car is running great since I did the head gasket job, flushed my cooling system, installed 15" wheels for the taller gearing, and made the rear wheels quite smooth to the airflow.

I drove a 130 Mi round-trip yesterday for work that averaged 64 miles per gallon. But what was most fun about it was that I did very little engine off coasting. I did at least 50 miles of steady throttle cruising. I did some engine on coasting. And my EOC was mostly in the stop/go LA traffic.

Before the repairs and the new wheels, I had noticed a breaking point in the fifth gear cruising characteristics of the car that looked like this: it wasn't possible to stay at or over 60 miles per gallon if I was at or over 40% engine load and it also wasn't possible to stay under 40% load if I was trying to travel over 55 miles per hour. Now I can do 60 miles per hour at 60 miles per gallon at 45% load. 40% load has become the breaking point for 70 miles per gallon.


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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