From the FAQ:
Q: How much should I budget for fuel costs?
A: It depends on your motorcycle’s MPG and your riding style. The total maximum miles will be less than 5,000. Thus 5000 miles ÷ 40 mpg=125 gallons @ $3.00/gallon = $375.00. Your motorcycle should be tuned up and ready for a long ride before you start. Your motorcycle should be capable of at least 150 miles per fill-up, or plan to carry an auxiliary supply for back-up if you have a small tank. (If you register as Fully-Guided we carry spare fuel for you.)