When the compressor is working, it would put additional load on the engine and that would definitely increase the fuel consumption. Futrhermore being a low powered engine, the difference could be more than others but you should not be experiencing more than a few % difference. However driving and road conditions makes a lot of difference with the additional load on the low powered engine running the A/C.
Previously when A/C was not that efficitn, the compressor would be working less of the time and now it has to work for longer periods so some increase in fuel consumption is expected.
Friday, May 6th, 2011 AT 8:32 PM