1. You can check your speed on the character window.
2. Each point of mobility = +1% speed (Horseriding/stamina is not counted)
Riding animal(donkey, pony, quarter horse....) makes you travel even faster.
133%. Seems like I am a slow guy. I have saved $2800 dollars for the Quarter Horse from our soon-to-be-lvl-10 General Store. It will take care of the speed issue.