WTF. i've literally been under a rock for 20+ years lol. What a crock that manufacturers use the 1ft/roll method of calculating. Depending on the application, they're giving us false #s by 0.2-0.3s give or take. What a big difference that is esp. in the sub-3sec category. Thanks for hitting me with some knowledge this Tues morn Kruppa!
The biggest issue is you'll never know which ones do this. Very few would ever provide that detail. Some language on it...
"Ever wondered why the 0-60 mph time from publication A is lower than the one from publication B? It's generally not because one has better drivers than the other, especially in today's world of launch control and automatic transmissions. Nor is it due to equipment accuracy, as everyone uses Racelogic VBOX data loggers. The time difference is usually due to the liberal use of a correction factor and the needless application of rollout.
A common practice is to cut the first 3 mph from a run, cutting as much as 0.3 seconds off the time.
Rollout comes from the drag strip. When you start a quarter-mile run, the timing lights don't start until the front wheel is all the way over the starting line. That number used to be approximated by subtracting the first foot of an acceleration run. Now a common substitute is to cut the first 3 mph from a run, cutting as much as 0.3 seconds off the time. Some publications post a 0-60 mph with rollout and others do not. Once again, there is no standard. In either case, it means the number in print isn't the number you feel."