I'm using it on an automatic w/ ecotec. I recommend, but if you drive like a granny (lol mileage?) don't bother. Much faster shifting, and keeps your RPMs up so if you're hard on the throttle you don't get jerked forward during a gear shift due to negative G force. If you're worried about how much you spend on gas don't get it, because it pushes back the shift point, to a higher RPM, which means more gas burned.
PS. You know mileage and the name AleroRacing don't really jive.
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