I'm new here. Just got a used 05 Matrix XR w. 4 spd. auto transmission. It says in the manual to always use overdrive to boost gas mileage and reduce noise. I mostly drive in urban settings, and it seems driving w/out the overdrive offers a little more responsive. Am I right, or deluding myself? Will this harm the engine or transmission. Any idea on the hit it will cause on fuel efficiency?
Thanks in advance.
Ted