It really depends on if you do your own servicing or not. 150cc oil change with valves needing to be adjusted about every 3-4k compared to fill the two stroke oil and change the spark plug? I don't see how a two stroke unless you build a race engine would cost more per mile, maybe to the environment but hey that doesn't matter too much... plus Agility 50 engine stock, SLOWWWWWW!!! Just my $.02