[teylix]

aerodynamic drag increases cubically. henceforth, so does the power required to maintain speed. Any one car will have a different optimal efficiency speed, however most passenger cars reach their peak around 50-60 mph. Large boxy vehicles such as trucks and SUVs will reach their peak efficient speed at around 45 mph.

Yup. Early 50s is what I'm used to hearing. People saying 75+ mph are just being ridiculous. "Variances" be damned.

Again, every member will have variances, including weight, tires, and even the spoiler.

Oh look.. a tired out response.

"Will I get more power out of a cold intake?"
Your reponse: "It depends on if the stars aligned, Zeus summoned a storm, and Michael Jackson comes back to life."

Anyways, sure it shifts around a bit but laws of physics still apply. The actual MPG might differ but the mph at peak mpg doesnt change a whole lot for any given car.