AC was great in the summer but...

But what you gain on the fuel you lose on the heating/cooling from the ACC, which is absolutely great except when the weather moves towards the extremes. Then the ECO ACC becomes ineffective.

It's the same principle as 'there's no such thing as a free lunch'!

 

Yeah we rarely use even the cabin fan, in fair weather, May through September. As soon as it starts to get stuffy, just shut everything down, control interior air by rolling windows down, a lot or a little. Depending on speed and ambient temps.

AC get's used very infrequently through the summer, mainly as a maintenance item, to circulate the oil. And through winter it's actually used more, typically in heavy rain when it's the only way to prevent fog-up.