Windshield wipers parking vertically along the A-pillars?

[Big time]

Wouldn't they create less drag than standard parking wipers?

Maybe they would also allow more air to flow over the car reducing spillage to the sides?

[Frank Lee]

Almost certainly would make things worse for 99% of vehicles.

[NeilBlanchard]

Wipers parked at the bottom of the windshield on most cars causes almost zero additional drag. A high pressure pocket of air air forms there, and it is almost still, most of the time.