If it's warm, I'll open my window a bit.
If it's hot, I'll also open the one behind it an equal amount
If it's Texas Hot (tm), I open mine about 1/2 and both rears 1/4.
I do consider the wind. If there's a strong wind from the left side I'll close those windows some and open the right side more. I figure there's less to lose on the downwind side. The relative levels of wind noise seem to confirm this.
I have hand-crank windows but also a small (ish) car and I can reach all the cranks from my seat.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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