|
If the 8th gen Civic Si has a sixth gear with ratio 0.0659 and a final drive 4.765 and my sixth gen DX coupe originally had a 0.702 fifth gear and a final drive 4.058, then your engine turns 3.14 revolutions on the freeway for every 2.85 in the older DX. Your engine will turn about 10% faster than the sixth gen DX. You will be in the 3000 rpm range at 65mph, I would guess. Taller tires would help.
Being able to cut the engine and glide is a key advantage of the manual. You'll likely get 10% FE improvement from that alone, maybe considerably more depending on conditions and your determination.
Still, if you are a highway driver and not devoted to hypermiling, the EX is a better choice in terms of FE.
__________________
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.
|