i am getting a yzf replacemnet tanks from clarke to replace the pig of a tank on my 98 wr400. what is the fuel mileage per tank on the stock yzf tank? i get like 80 miles per tank on the wr. will i need to refuel during a 2-hr harescramble? (gone 25 miles in one before) i know i had to when i rode a two smoke. thanks.