first try

app/routes/pitstop.py

@@ -226,5 +226,6 @@ def get_pit_stops():
             "regulars": vehicle.regulars,
         }
         user["vehicles"].append(v)
+    user["vehicles"].sort(key=lambda v: (v.data[-1].date, v.data[-1].odometer or 0 ))
 
     return render_template("pitstops.html", user=user)