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Old 03-16-2018, 01:40 PM   #9 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,265

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 59.78 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,878
Thanked 1,572 Times in 1,069 Posts
Holy cow! You have really short gearing for an FE car on a Fit Sport auto from '08:

5-Speed Automatic Transmission Gear Ratios:
1st:2.996 - 2nd:1.679 - 3rd:1.067 - 4th:0.756 - 5th:0.550
Final Drive:4.560

Without a transmission swap, look for taller wheel/tire combinations to reduce RPMs at freeway speeds. Honda lists the factory tire size as 195/55-R15. I am confident you can get a 16" wheel that will be as light or lighter than stock and bolt onto your 4x100 hubs. But even with your existing wheels and stepping up to 195/65-R15 gives you a 4.2% reduction in freeway RPMs. Go to a 16" wheel and use 195/65 tires and you'll prolly get 9% or 10% reduction. Good luck.

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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