RE: Air Conditioning
I find the A/C on my Dart is more efficient than my Mazda 3 was. The Mazda 3 A/C compressor would click on and off even when cruising. I'd always have to turn it off to launch quick as it did NOT shut down on hard accel. In the Dart I don't notice any of this, while there is drag it seems consistant, not on/off unless you floor it then it shuts down the A/C temporarily... this is by design.
All small engine cars that I've ever driven have a noticible power loss when the AC is on... especially at low RPMs.