Here is a picture of the airdam under the bumper of a 2002 5-door Peugeot 206 (I believe that the 1994 Mazda 626 had something similar):
Notice that it doesn't extend the whole width of the bumper. Does this help or hurt FE? An airdam should span the width fo the bumper, maybe even wrapping around some, stopping air from going under the car and shoving it around the sides. In this case the extra airflow is directed straight onto the tires, increasing drag.
Would the car be better off without it?
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread