help me find my sweet spot rpm for shifting and cruising rpm. i have been shifting at 1800-2000rpm at about 95% engine load without any noticeable gain in fuel economy. i have been trying to improve the mileage on my impreza in the city but i cant get any better than 22mpg. i have found an old subaru bsfc map but i think it's irelevant since it's for the old 2.2L with out AVLS (subaru's VVT). here is a dyno chart of 2.5L (red is stock):
according to some dynos i have seen a/f is leanest at 2.3k rpm at wot. i have more charts if needed.