MT I'm not saying that it cant be done or that you dont save, its just that people who fly YS use it because they want the best engine and the best power source out there, not because its cheap... for example, I'm sure a non carbon golf club is cheaper.... but you want the best!

more economy is good, and people will like it, IF it gives you same performance... for example, the CDI, that saves a lot of fuel and has the same performance or better than glow plugs, total success!

its like sports car.. none will give you fuel economy... you just want the power!! no one when buying a ferrari, porsche, Lamborghini, etc is looking at its fuel economy. in this case YS is the Ferrari of F3A engines

you are right! in the cost you should include the purchase and maintenance of the engine, trust me after 350 flights... you wil need a new DLE

about the wet sump, another reason is why carring the weight of the oil??