You'll have to pick either economy or performance and tune for one of them. Trying to maximize for economy isn't going to provide the maximum performance and vice versa. When it comes to timing, that is one of those areas where it should be best said, "That your results will vary!" To try and give a blanket statement that will apply to a large majority of applications isn't realistic. You'll just have to tinker with your combo because too many variables are going to affect it from external conditions like outside temp and quality of gas you run, to internal engine components like camshaft, carb and other engine mods and how well they interact together. Its just difficult for achieving optimum economy to expect optimum performance to exist at the same time.
