Fascinating fact:
What is the circumference of the earth?
The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers).
But, if you measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). This the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like)."
If a diesel van does 40mpg, and diesel costs 3pound 61 a gallon, it costs 2247 pounds to drive around the world. So its quite a bit cheaper to fly.