Not near enough to justify firing up car #2. Assuming he’s “hanging out the passenger side of his best friend’s ride, trying to holla at me”, crawling by in a city setting where most all cars get dick mpg anyway, wind resistance isn’t as much a factor as the energy required to keep the car rolling at sub-optimal speeds. In lower gears. And all the stop & go traffic.
Won’t that increase wind resistance causing the fuel economy to drop? How is that a smart financial decision?
Smart for the guy hanging onto the car
Not near enough to justify firing up car #2. Assuming he’s “hanging out the passenger side of his best friend’s ride, trying to holla at me”, crawling by in a city setting where most all cars get dick mpg anyway, wind resistance isn’t as much a factor as the energy required to keep the car rolling at sub-optimal speeds. In lower gears. And all the stop & go traffic.
Not really at low speeds.