As long as the mono jet, integrated head and cam are still on the engine, I might as well tune for economy. Once I do a top end swap, then I can tune for performance. I'm using it as a daily driver until we replace the 4wd SUV that was totaled last winter, so easy on fuel would be nice at this point. So just keep trying different combinations of advance and check against miles at each fill-up to see which works best, keeping notes on all of them?
