I think I have found an issue with the estimated travel time calculated by Kurviger.
I read this documentation, and couldn’t find anything regarding this issue, or travel time estimation in general.
This issue appears to be most prevalent when using the
fastest available setting.
Route 1 below, when set to the
fastest available option, provides a travel time estimate of ~6-6.5 hours in Kurviger when in reality, they are closer to 4.5 hours.
Route 2 estimates 2.5 and ~2 hours for Kurviger (
fastest available) and GMaps respectively.
For the two examples provided below, the estimate provided by GMaps is accurate (or at least very close). The route I drove yesterday (similar to route 1) was generated with the extra curvy setting, which provides an estimate of ~10 hours. This estimate proved to be much more accurate, although with the stops I made along the way, it is a bit hard to say for certain. My best guesses are that the speed limits in the OSM database for these sections of the interstate are incorrect, or there is some kind of global max speed.
Due to the two-link limit, I put the links to the routes in this Google Doc: Kurviger vs. Google Maps Travel Time | Google Docs