The off road speed of the Tiger 1 is 15 kph
And the Pershing defintly wouldnt go 5 kph kek.
By the way what kind of source is that? Tom Jentz and Hunnicut have been some of the main sources for armor information since they base the statistics on documents from germany and aberdeen.
I have a book saying that the Tiger II is comparable to modern MBTs like the Abrams, and thats part of the reason why i would only keep myself to certain secondary sources.
This particular one is written by polish guy who is specialized in WWII history and has many books about weaponery during WWII.
(for example in different book written by some US guy I can see Tiger with 45km/h while Pershing 46km/h on road).
As for the off road, Ive found that Pershing was about 8-12km/h, while tiger 16-20km/h.
But as we see numbers are really different depending on the source. Yet, Im quite confident that Tiger was faster on off road.