Robert1893: Once you hit Legend tier, I don't think that's true.
^^^^^^ This!
hleland: how many strokes below par do you need
Think in absolute strokes and double the scores of nine hole rounds, because a 30 (=60) counts the same regardless of the course!
One additional note to
hleland: What are the ways to improve you average
If your aim is to tier up, this is not the core of the subject. It doesn't matter IMHO if your average is 64 or 62, unless you are in a competition with a friend. All that matters is to collect 500 scores to form a 60.000 average. 65 or higher scores are probably out of this collection, even if they contribute to your current average.
Have fun!