Surely one expects to be close to those limits???
It is an example they used, but as they state in the text, servos vary in range. Keep in mind that R/C servos were developed for the model industry. They typically use adjustable mechanical linkages from the servo horns (or wheels) to the thing they are actuating, here is a link explaining: http://www.powertorque.co.za/epf/pdf/servoset.pdf
. That way they can adapt the servo a given servo rotation to the range of mechanical motion they need. There was never a need for all servos to move the exact same number of degrees per usec.
Is your application dependent on having 180 degree rotation?
Edit: Some more quotes from goggling around on "servo travel":
"Rotational Distance. If you connect a servo to your receiver, plug in the receiver battery, turn on your transmitter and exercise that servo, you'll probably find that the servo arm goes about 90º total from one extreme to the other. This seems, also, to be a standard setup for computer radios; the Travel Adjust/ATV/EPA values are defaulted to 100% in either direction.
Most servos, however, allow for ±60º rotation. What's happening here? Why don't the servos move the entire 60º when the TA/ATV/EPA value is 100%?"
Here is uTube video showing how a guy modified his servo to increase it's travel to 180 degrees, he said it orginal only went 90 degrees prior to his mod: