Time Turner
You are filled with determination. (R/GD/TT)
The guide does list a couple .5 examples, but they're few and far between. The guide lists Wildlife as having a speed of 8.5, like the article, but also a weight of 6 and a handling of 3, unlike the article which goes to .5. These stats were added by Mariomario64, who stopped editing in 2014 and also seems to have added the stats for most of the karts. The example you used, Banisher, doesn't match up either. To compare the article and the guide, the article lists that it has a speed of 2.5 while the guide says it has a speed of 2, the article has an acceleration of 9.5 while the guide has 10, the article has a drift of 4 while the guide has 5, and the remaining stats are the same. I could chalk up the speed and acceleration differences to rounding, but the drift's off by a unit. Those stats were added by LaLaLand123, who also stopped editing in 2011. What bugs me the most is that, besides LaLa's addition and the .5 numbers (other example (ROB-BLS)), Mariomario's stats are consistent with the guide. It makes sense, as the guide was released in 2010 and Mariomario made their edits in 2011, but the .5 has to have come from somewhere that I'm just not seeing. Maybe it really is just as simple as "they did it by eye".