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California98Civic · 07-28-2020, 12:20 AM

I am familiar with the rule of thumb about fuel economy and aero drag. I think aerohead has posted it up a couple times. I do not know what it is based upon. Nonetheless, 0.15 is certainly not the Cd of your car, though I can easily believe that 0.27 figure, plausibly. Factors like ambient temp, humidity, wind, tire wear condition, and drivetrain and charging system conditions can all affect our results, so as you onow we take results as provisional possibility only unless the testing is very rigorous. I like you project a lot!

Here is a muffler/exhaust thread and summary I created years ago to distil into one place what seemed the best thinking on this site about such mods. I think it will help you, maybe:
https://ecomodder.com/forum/showthre...tml#post289125

07-28-2020, 12:20 AM	#35 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 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 2,172 Times in 1,469 Posts	I am familiar with the rule of thumb about fuel economy and aero drag. I think aerohead has posted it up a couple times. I do not know what it is based upon. Nonetheless, 0.15 is certainly not the Cd of your car, though I can easily believe that 0.27 figure, plausibly. Factors like ambient temp, humidity, wind, tire wear condition, and drivetrain and charging system conditions can all affect our results, so as you onow we take results as provisional possibility only unless the testing is very rigorous. I like you project a lot! Here is a muffler/exhaust thread and summary I created years ago to distil into one place what seemed the best thinking on this site about such mods. I think it will help you, maybe: https://ecomodder.com/forum/showthre...tml#post289125 __________________ 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.