diff --git a/world.py b/world.py
index 08e58de..2a619cc 100644
--- a/world.py
+++ b/world.py
@@ -255,7 +255,7 @@ class World:
 
 		The following assumptions are made to speed up the process, at the cost of
 		accuracy:
-		- All tiles have the exact same movement speed (600 milliseconds / meter)
+		- All tiles have the exact same movement speed (500 milliseconds / meter)
 		- All tiles are in-bounds
 		- All tiles are at the same elevation
 
@@ -269,7 +269,7 @@ class World:
 
 		>>> world = World([], lon_scale = 500, lat_scale = 400)
 		>>> world.heuristic(Point(0, 0), Point(3, 5))
-		1632000
+		1360000
 		"""
 
 		# Taxicab distance in each direction
@@ -290,7 +290,7 @@ class World:
 
 		# TODO: Test whether adding in elevation is beneficial
 
-		estimated_speed = 600 # milliseconds / meter = microseconds / millimeters
+		estimated_speed = 500 # milliseconds / meter = microseconds / millimeters
 
 		return estimated_speed * total_flat_distance