Gosh, I'm all over the place. Depends on what I'm feeling. Sometimes I love a strong 1:8 or 1:10, it has increased body and sweetness and more intensity of flavor. The only downside is it doesn't last as long! So to get that larger cup (without overdosing on caffeine
) I tend to do a 1:15, for easy math, as well as having a difficult time getting good results with a ratio any higher. I also find 1:15 is kind of my limit for how weak I can handle coffee... 1:16 or higher just gets too watered down for me and starts to taste more like a weak tea. Sometimes I get lower to a 1:12-1:14 when I have a hard time getting flavor out of a coffee. I do 1:6 for cold brew.