I'm relatively new to dirt bikes. I've owned one a few years back, but never really liked it. Now I want a bigger one, that is dual purpose. (street and offroad) It would be great if you could point be in some directions? - speed 70+mph. Fuel at least 60mpg. Heavy enough so it can travel fast (60mph on street) while maintaining good control on roads, - without wind problems or swerving. but still light enough for off-road. I will probably get a used dirt bike, because price range is about $1,750. - thanks for the help!