Just an update, my first test drive diagnosis was incorrect. I took it for a more varied drive this time and it seems a bit sluggish on level roads up to 40mph (I didn't try going faster than that on our local roads). I would get up to speed in an acceptable amount of time, but it almost seems like its running on 3 cylinders. However I tried going uphill from a stop and it seemed to take a good 1/4 mile to get up to 40mph. It was accelerating EXTREMELY slow uphill. Any thoughts? Is this safe to drive to the mechanic 10 miles away?