MT vs AT----fuel efficiency

[why?]

Originally Posted by bronsin

Isnt the echos engine and drivetrain identical?

Originally Posted by Em_

yes it is i don't get the other statement

no it is not. The engine is the same.

they are closer than I thought though.

I wonder if the final drives will swap easy enough to change it.
The echo used the C150 gearbox, with ratios of
3.555/1.904/1.310/0.969/.815 reverse:3.250final=4.05
The Yaris is the C50:
3.545/1.904/1.310/0.969/.815/Final Drive: 3.722
Reverse: 3.250

as anyone who plays GT can tell you, the final drive makes a gigantic difference. In this case, it is the complete difference between the Echo's 99hp rating and the Yaris' 105. That and the extra 100+ lbs the Yaris has over the Echo tells why the Yaris won't get the same gas mileage.
sources:
http://www.cleanmpg.com/forums/showthread.php?t=252
https://www.google.com/search?q=toyo...ient=firefox-a
http://www.vibratesoftware.com/html_...sions.htm#C150
http://www.vibratesoftware.com/html_...oyota_Echo.htm
https://www.google.com/search?q=toyo...iw=911&bih=383