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California98Civic · 03-16-2018, 03:24 PM

Actually, I want to correct my last post a little. The Fit auto's freeway RPMs, in top gear are 23% LOWER than a Fit manual would be. Your RPMs will also be significantly lower than the Fit manual in 4th gear (I did not calculate how much but maybe near 20% lower). Basically, the final drive gear is significantly shorter on the auto, but most of the auto's higher gears seem so much taller than on the manual that they way over-compensate. Highway cruising RPMs in your Fit should be significantly LOWER than a 2001-2005 Civic HX manual (like maybe 8% without accounting for wheel/tire size).

You could certainly work harder using a Fit manual trans and get better FE (check out the "PaleFit" on this site), but your auto is serving you pretty well.

Get the taller 195/65-16 wheel/tire combo I mentioned and your actual cruising RPMs on the freeway might match the legendary Civic VX fuel sipper.

I think I got it right this time.

03-16-2018, 03:24 PM	#12 (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 2,174 Times in 1,470 Posts	Actually, I want to correct my last post a little. The Fit auto's freeway RPMs, in top gear are 23% LOWER than a Fit manual would be. Your RPMs will also be significantly lower than the Fit manual in 4th gear (I did not calculate how much but maybe near 20% lower). Basically, the final drive gear is significantly shorter on the auto, but most of the auto's higher gears seem so much taller than on the manual that they way over-compensate. Highway cruising RPMs in your Fit should be significantly LOWER than a 2001-2005 Civic HX manual (like maybe 8% without accounting for wheel/tire size). You could certainly work harder using a Fit manual trans and get better FE (check out the "PaleFit" on this site), but your auto is serving you pretty well. Get the taller 195/65-16 wheel/tire combo I mentioned and your actual cruising RPMs on the freeway might match the legendary Civic VX fuel sipper. I think I got it right this time. __________________ 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.