As an experienced driver focused on fuel efficiency, I never crank the air conditioning to full blast right at startup, even on scorching days. This simple eco-driving habit helps me save significantly. Instead, I roll down the windows if I'm already moving or fling open all the doors if stationary.
Plus, AC isn't very effective immediately after starting anyway—it needs time to kick in properly.

During the engine warm-up phase, running the AC demands even more fuel.
For short trips, blasting the AC at startup can spike consumption by up to 40%.
Thanks to this eco-driving practice, I've cut my fuel costs noticeably.
The less I rely on AC, the less fuel I burn—it's straightforward mechanics.