Ok, I had to look up the ratios and engine.
http://www.tercelreference.com/terce...cel_specs.html (ratios and engine)
http://www.tirerack.com (tire size - 155/80R13)
http://www.f-body.org/gears (gear calculator)
The Tercel site says there's only one engine available in the 1992 Tercel.
4 speed C141 transmission:
3.545, 1.904, 1.233, .885; final 3.526
MPH @ 2000 RPM - 11, 20, 31, 43
MPH @ 4000 RPM - 22, 40, 62, 87
RPM @ 25 MPH - 4700, 2500, 1600, 1150
RPM @ 50 MPH - explosion, 5000, 3200, 2300
RPM @ 70 MPH - explosion, explosion, 4500, 3233
5 speed C150 transmission:
3.545, 1.904, 1.310, .969, .815; final 3.722
MPH @ 2000 RPM - 10, 19, 28, 38, 45
MPH @ 4000 RPM - 21, 38, 56, 75, 89
RPM @ 25 MPH - 4850, 2600, 1800, 1350, 1100
RPM @ 50 MPH - explosion, 5200, 3600, 2650, 2250
RPM @ 70 MPH - explosion, explosion, 5050, 3750, 3150
So, the total range is about the same. The 5 speed has a marginally shorter 1st and a marginally taller 5th when you count the final gear. 1st and 2nd are almost the same; 3rd is a little shorter in the 5 speed; high gear is a little taller; and the 5 speed's 4th splits the difference.
I'm just not seeing a transmission-related reason for the city fuel economy rating to suffer. What else was included with the option package that had the 5 speed?
........crap, I just realized I left this message unposted, all ready to go an an abandoned tab in my browser. I referenced it in a post I've made since, too, thinking that I had already posted it.
theholycow 
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