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You may get a better indicator by looking at how vehicles designed for efficiency perform with automatics vs manuals. I.e. metros, civics, etc:
1998 metro 1.3 litre mpg ratings per fueleconomy.gov:
manual 33 city, 39 hiway
auto 26 city, 31 hiway
2004 jetta tdi:
manual 32city, 42hiway
auto 28city, 39hiway
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"I kicked a giant mouse in the butt! Do I have to draw you a diagram?"
Last edited by dcb; 05-02-2009 at 12:21 PM..
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