hi all can i ask a question abt willer express...

■Full Throttle Campaign 7 seats available JPY 3,800
■Senior Discount 4 seats available JPY 4,300
■Early Discount 21 3 seats available JPY 4,300
■Early Discount 14 4 seats available JPY 4,500
■Student Discount JPY 4,800
■Normal Plan JPY 4,900

this is the info i got from the web on overnight bus....what is the difference btw full throttle campain and others??? it seems it is cheaper than the early discounts...pls advise...thks