Very throttle finger, drive style, as well as, track size dependent. But if you were to somehow have the exact same track layout and be able to change it from high traction to low traction, many people will get less mileage on a low traction due to the additional wheel spin. It can be difficult to go fast on a low traction track without breaking traction at some point. And those drivers that tend to drift around corners in low traction will get terrible runtime.
I find that it is much easier to drive punched the whole time in low traction, and be in a controlled drift around the track although it may not necessarily be the fastest way around the track and it usually results in bad mileage (Ryan Lutz's old school truggy days show you how drifting around the entire track is fast and awesome to watch).
Try driving punched the whole time on a high bite track and it will only get you in trouble. You have to be much more precise with your throttle finger in high bite tracks and you tend to break traction far less often.
So in the end, really just depends on driving style and throttle control.
Spot on! 100% agree. Runtime is directly related to throttle input. Obviously, throttle input is directly related to available traction/track layout/ driving style. There are soooo many variables.