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Old 04-04-2020, 01:30 PM   #6 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,090

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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Originally Posted by Frank Lee View Post
I use 1000-1200 ft/mn piston speed as optimal efficiency zone. I have not personally tested it but several sources that seem legit to me point in that direction.
How do you calculate/track that while driving? Is there a formula? Seems like you'd need a variety of piston and stroke data as well as RPM.

To the OP: my preferred shift ranges are 1500-2000 rpm or 1700-2200 rpm, and I kinda use the latter more often. My fav cruise option on the freeway is 60 MPH @ about 1900 rpm. At that speed I can get high 60s mpg on average. But I often do pulse and glide on the freeway, using 55-65 mph, 55-70 mph, or 60-70 mph speed ranges.
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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