I think this has been mentioned before on other comparisons of 0 to 60 times .. US mags (ie Car and Driver) always use a One foot roll out setting on their P-Box as that is normal for US drag times. UK Mags (Evo) dont use the rollout
From w w w.nogaroblue.c o m/27978/30426.html but pasted here in case the link screws up
So what is rollout ??
Rollout defined: The concept relates directly to NHRA dragstrips and the measurement methods used in quarter mile racing. For the unfamiliar, this is how it works. When you pull into the staging area or starting line, there are two light beams which are aimed perpendicular to the track. The first light beam is the "pre-staging" light. It has no real function except for telling you when you're getting close to the starting line. The 2nd light beam, called the "stage" beam, is the actual starting line. Ignoring staging strategies (shallow stage, deep stage, etc), we'll assume the car pulls up to the staging line until the beam is just barely broken by the front tires...as this red Civic shows below (the black wheel).
When the light turns green, the driver mashes the gas. However, the timing clock doesn't know that the car is moving until the front tire moves far enough away from the light beam to allow it to fully shine across the track. This is demonstrated by the grayed out tire in the below photo. In reality, the car moves a distance of about 12" taking 0.3 seconds for free...the clock hasn't started yet. Once the clock starts, the car is already moving 3 mph
That brings us back to modern day test measurements. Car magazines and car manufactures don't test on dragstrips very often. They use sophisticated computerized GPS or "5th wheel" type measurement systems. A commonly used system comes from a system called a Racelogic VBOX.
How does this all tie together? Well, this fancy measurement system eliminated the need to have an optical start/stop line like a dragstrip does. However, magazines want to publish times that relate to what the average Joe can accomplish if he takes his car to the local NHRA dragstrip...so all the major US car magazines still test with a 12" simulated rollout. This also makes acceleration times look faster on paper, which of course sells too.
Car and Driver, Road and Track, and Motortrend all use this simulated 12" rollout. That means when you read any acceleration statistics in those magazines, it's not a true 0-60, 0-100, or 0-150 mph time. It's actually measuring 3 mph to 60, or 3 mph to 100, or 3 mph to 150. The car starts from a stand still, but the clock doesn't begin to run until the car has moved 12", gained 3 mph, and traveled for 0.3 seconds.
GM and Ford also use rollout when claiming their factory times.
Also all American Mags use "corrected" figures based upon weather etc there is a good read here w w w.insideline.com/features/how-we-test-cars-and-trucks.html
In that article they show the same run data, used differently would show a 0 to 60 time of between 7.92 and 8.61 seconds depending on how correction maths was done and if rollout was used
So in Summary - This means that British, German, or Japanese magazines will clock times that are 0.3 seconds slower than US magazines for the same car as they time true 0-60 and true quarter mile times. They use no rollout. The 12" / 0.3 / 3 mph "advantage" is of course based upon tyre size so is an "about" figure not an accurate one
So Amars figures "corrected" for rollout would be
C6 RS6
0-60 in 4.3 (Evo Mag)
0-100 in 9.7 (Evo Mag)
C7 S6
0-60 in 4.0 (Car & Driver)
0-100 in 9.5 (Car & Driver)
That is unless he added the 0.3 himself
Ex RS6 C6 Driver, gone but not forgotten.. The best car I have ever owned