This happened with the Gen 2 and it still happens with 2015 Prius in that the whole cars 'moves' side to side when the wipers wipe. Also when there is a car that fly pass you when you were stopped, the car shakes with that high speed wind.
welcome! i can see the wind, but i've never experienced the car moving with the wipers. you may want to look at suspension mod threads, like a chassis stiffening plate, etc. all the best!
I also can't say I've noticed it with the wipers. But I can say I've noticed it when cars zoom pass, especially a larger vehicle. But most of the vehicles I've owned in my life have been smaller, lighter vehicles and this reality is simply "physics". I got the same affect in my Honda Fit. Even my 1990's Accord. And if the trade off is better gas mileage....I'll deal with the "wind". Grew up driving a 80's Toyota Tercel. That car had great MPG BUT if you put the wipers on high it would actually *start moving sideways. *slight exaggeration The Prius is a rock by comparison.
Suspension mods helped remove the waving motion when a car passes me on opposite sides. I almost forget it did do this early on before mods. I'll pay more attention now that you mention it.
