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ke5aux · 08-28-2009, 04:35 AM

Hi, as I am building an 89 Civic hatch, I came across a question that I could not find an answer to.

Basically, I have two transmissions available to me. The original manual 4-speed or the Sedan/CRX 5-speed.
I assumed that the 5-speed would give me better milage as the engine would operate at lower RPM's at highway speeds, but the fueleconomy.gov website begs to differ. It lists the 4-speed as 29/35 MPG while the 5 speed is at 27/33 MPG. I am wondering if the readings are skewed as the 4-speed came only on the STD Hatchbacks and never on the Sedans. The CRX with the 5-speed (which is slightly lighter than the civic hb) is listed as 29/37, but then again, it is a more aerodynamic shape.

Any idea if I should keep the 4-speed or go with the 5?
Thanks

08-28-2009, 04:35 AM	#1 (permalink)
ke5aux EcoModding Lurker Join Date: Aug 2009 Location: Houston Posts: 3 Thanks: 1 Thanked 0 Times in 0 Posts	Manual transmission gearing 4>5? Hi, as I am building an 89 Civic hatch, I came across a question that I could not find an answer to. Basically, I have two transmissions available to me. The original manual 4-speed or the Sedan/CRX 5-speed. I assumed that the 5-speed would give me better milage as the engine would operate at lower RPM's at highway speeds, but the fueleconomy.gov website begs to differ. It lists the 4-speed as 29/35 MPG while the 5 speed is at 27/33 MPG. I am wondering if the readings are skewed as the 4-speed came only on the STD Hatchbacks and never on the Sedans. The CRX with the 5-speed (which is slightly lighter than the civic hb) is listed as 29/37, but then again, it is a more aerodynamic shape. Any idea if I should keep the 4-speed or go with the 5? Thanks