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Old 06-02-2020, 07:44 PM   #18 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,092

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 gregersonke View Post
Truthfully, I did it for the crosswinds not fuel economy. The fuel economy was the 20k miles before and thus far the 4k after. But an observation afterwards of a sudden spike in fuel economy immediately following was a bonus on my part and it's been pretty consistent, i've not seen a single decrease in fuel mileages. I've even beaten previously set fuel economy highs on trips with higher average speeds no less. Where I used to get 44 to no more than 47mpg covering a large part of a 72 mile each way journey at 80-82mph now I'm getting 51-56mpg (no battery) and up to 78 mpg (previously 72-75) mpg when I daily charge each way. Which would require me driving 70-75mph before to achieve and now doing at higher speeds. With the Covid 19 traffic, I've had to speed up to avoid basically being run over on the I5 interstate route I take every day. It's pretty crazy that such a simple modification would make so much difference.
Well longterm fuel economy returns can be hard to argue with, and I don't especially want to. It's just that there is a lot of hype about those tabs. It seems you may have happened on some very good placing of the tabs. I have read that placing matters a lot and that tiny changes can have notable effect. I think it would be really informative to see pictures of how you have placed them. Wanna post some pics and measurements?

EDIT: Ooops... missed the photo you posted. Still, what are the relative measurements to the edge of the lip, height, and details like that.
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.

Last edited by California98Civic; 06-02-2020 at 08:00 PM..
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aerohead (06-24-2020), gregersonke (06-02-2020)