Quote:
Originally Posted by undeRGRound
Possible, but unlikely?
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Well... there's also tank-to-tank variances. My car would sometimes run differently when I filled up the same "grade" at different gas stations. YMMV... and Vary Very Greatly, at that.
Junkyard "Mazdaspeed" ECUs are a big thing amongst Protege owners (they're called Mazda Familias, pre-00, then were sold as Ford Laser/Lynx sedans post-00) over here, as it bumps fuel economy and adds a little power on high octane.