The autos aren't too bad, and the 36mpg is the sort of mileage my mom gets in hers, and she is, by no means, an ecomodder. If you really want to go for the mpgs eventually going to standard would be better...though I'm not sure if it would be worth the work involved. (Though if you did you could always put the 4 cyl transmission and change other stuff while you were at it).
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