QUOTE (Ravindra Nagpurkar @ Jan 15 2010, 13:08)

I actually disagree.
When your are accelerating or using the steep torque Coeff of Drag impacts in two ways
1 - It makes the car go slightly slower, to counter that different engine maps are used to boost acceleration. This increases fuel consumption. (compare figures across McLaren , Brawn and Force India)
2 - Coeff of Drag generally impacts what engine maps you choose during fuel-conservation runs (while leading, behind a safety-car or in rain) and a higher Coeff of Drag compromises the best engine maps you could run and worse your competitor might be running.
How about the following as an additional one:
1. two, cars A and B, that can go round a given corner at 50mph because they have the same downforce/grip etc and have the same power
2. car A has more drag than car B
As I see it, car A will approach the corner at greater speed than car B thanks to its lower drag. Car A will therefore come off the throttle earlier to hit the brakes and get down to 50mph in time for the corner. Hence car A will be on full throttle for less time and therefore use less fuel.
Have I got that completely wrong or is the effect so marginal as to not make a meaningful difference on consumption or is it right and drag does have an affect?