H-space

Fig.01 Fig.02 Fig.03 Fig.04 Fig.05.01 Fig.05.02 Fig. 06 Fig.07 Fuel saving figure in hot weather ( 38- 40*C) 1- You can reduce at least 10% fuel consumption in full-occupants mode 2- Reduced 25% fuel consumption in single occupant mode (a driver only) for sedan, and much more for SUV, MPV or bigger vehicle... due to reduction of Air conditioning workload(*) * A/C system normally consumption about 4 HP of Engine Power. Bigger space required more cooling time, thus increased engine workload and fuel consumption, especially, in Hot Running Climate. Other knowing about linking fuel consumption with A/C usage on your car, go to http://www.nrcan.gc.ca/energy/efficiency/transportation/cars-light-trucks/buying/16740 and  Bon appetit...

Fig.08 Fig. 09 Fig.10 Fig.11

                                                                                                       Source :www.porsche.com/2013