The size of Fuel's open world is truly astounding. Let's take a look at some popular recent open world games and compare. Fallout 4 comes in at 43 square miles. GTA 5 is 49 square miles. The Witcher 3 just about doubles those to at 84 square miles. Just Cause 3 goes to 400 square miles. How much bigger do you think Fuel is??? Believe it or not, it is 5,560 square miles!! I can't believe how tiny it makes other games seem. It could fit like 10 Just Cause 3's inside it with room to spare!! And it all really is one giant functioning area. Unbelievable.