Well... on the highway. Back when I lived in El Paso, a good friend had a 2014 Jeep GC Diesel. Pretty sure it also has a 24 something gallon tank. Anyway, we would expore when work permitted and everytime, he had only about a bit over a gallon more than me at the end of the day. We would turn around at half a tank (both carried 8 gallon of spare fuel). So yes he had more, but it wasn’t enough to make a real functional difference. Diesel aside. His transfer case clutches over heated a lot (something we don’t even have) and his Jeep turned off when driving home. Like, at 75 mph. Just turned right off. Sad really.