I have had my bike going for a week or so now, and the whole time i have been noticing terrible gas mileage. Today i put about 1/5th of a tank of gas in, and i went on about a mile or less long ride, and when i returned home and checked the gas level the tank was dry. So i am getting 10-15 mpg. Is this a problem with my carb? I have a 66cc china girl engine and the so called "Speed" carb which had the ugly red plastic airbox on it when it was delivered, although i have since removed the plastic piece. Any input would be greatly appreciated. Thanks!