Those little dealies are aero aids. They deflect air from in front and from themwalsh wrote: Here are the stock flaps, in front of each wheel. Big one on the fronts.
Tiny one on the rears. Don't know what purpose they serve other than
maybe helping to stop your tires picking up rocks thrown up by other vehicles?
center of the car from hitting the tires, and then getting sucked up into the
vortex/maelstrom of swirling air in the wheel wells, outboard of the wheels,
and even downstream of the wheels. IIRC, if they are done correctly, they are
worth something like a 5% MPG/eMPG increase.