Toyota Etios query

So would it cost so much more for the air-con to be electrically powered as with the Yaris ?

Yes, the option of hooking everything onto the auxiliary belt is much simpler and cheap. If they have to get an electric one there's design considerations that must be taken care of.
 
I'm more interested in your "Sport" button. Any noticeable difference?

Actually that is not my car. Was a stock foto I got off the web. The south African bolt is set to sport mode as standard. The Indian one is set to city mode as standard lol. Mine has has a eco and city button as sport is the default mode. And yes....you can feel a big difference in between the eco and sport mode.
 
Any aircon will put more strain on your engine and make it work harder. Even in big engines this will be the case, though the actual physical difference wont be as noticable to you as the driver, it will show in your fuel consumption.

I have read about cars with electric aircons, but I am sure they too will use more fuel as the power must still come from the engine, be it with a belt that turns the compressor, or electricity from the alternator. I can just imagine that with electric aircons the effect of what it has on the engine power response that you might notice as the driver will be less. Perhaps I am completely wrong.

If you are on the highway in the city or on the open road to nowhere, then the fuel consumption increase due to the aircon should be less as the car has picked up momentum already and stays at a relatively constant speed compared to in the city where you constantly have to stop and pull away again. That is why they say rather use your aircon when on the highway compared to driving with windows open as the drag caused by open windows could actually have a bigger impact on fuel consumption compared to a aircon that is happily chugging along with a engine that is cruising at highway speeds.

Anything run off an engine, whether it be off an auxiliary belt or electrically run via the alternator will have an effect both on available engine power and fuel consumption. Smaller engines are affected more since the 'loss' in power has a greater net effect on available power.
 
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