BulletVI,
There is an explanation for that. First, you dove from a higher altitude and thus gained speed. Second, the Mossie weighs in over 20,000 pounds. That thing can hold E better than the vast majority of the planeset in AH. Its energy retention allows it to hold speed for longer durations of time. Third, youve got two inline liquid cooled engines that produce a lot of thrust. Due to its design, it is also a very aerodynamic airframe. This again allows for better speed retention. I am not saying that the Mossie is the best in anything, it just has some good traits/features that allows the Mossie to perform the way it does.
I am not an aviation engineer, so someone with expertise in the field can shed some light on the subject better than I can.