Wondering why people complain that Yaris' cant get good mileage?!

[yarrr]

Originally Posted by Yarisduder

So what was said above is that if on my two best tanks I hadn't run the AC I'd have gotten about 50mpg? How much energy does it really require to run the AC? 1hp? 2hp? I doubt more than that, so I should probably see a mere 1 to 2% increase in fuel mileage if I turn it off. Thinking back though, my best mileage is with the air conditioner turned on, maybe it's because the fuel atomizes better in hotter weather? Maybe it's because I changed the engine air filter? It certainly has nothing to do with the AC.

Does the Yaris require the full power of it's engine to keep moving? Is it possible that the AC operates on extra power that would otherwise be wasted and therefore only affects your fuel efficiency when accelerating or driving very very fast?

On the freeway, having windows down creates drag which hurts your FE than having the A/C on.

And no, the A/C doesn't run on magical "extra energy." Just about every ounce of wasted energy has been engineered out of modern highly fuel efficient cars.