Mine are lasting 2-3 weeks depending on usage and I'm a heavy user so I kind of fell in love with this tank for that reason. I don't let mine sit over night either; I don't have multiple set ups so I'm way too impatient and the thought of relaxing in bed at night without my vape makes me anxious haha.
Here's a quick reference I found:
100% PG – The stealth vape! Less vapor production so you can vape in settings where you normally don’t want to be seen blowing clouds. Flavor is carried better in PG as well as the throat hit is strongest in this blend. If you really want to feel your vapor you might want to try this mix. Consistency is more like water then syrup.
70% PG / 30% VG – Mix of strong flavor/throat hit with more vapor production and moisture associated with VG. Thicker then 100% pg but still on the runny side.
50% PG / 50% VG – Best of both worlds flavor, vapor production, throat hit are all here and the liquid is neither thick or runny.
30% PG / 70% VG -Very moist cool vape with big clouds but the flavor and throat hit associated with PG are more pronounced then the 100% VG. Thicker than 50/50
100% VG/MAX VG – Natural with huge vapor production and a cool moist vape with a slightly muted flavor and very little to no throat hit. Syrupy consistency and may not work well in certain atomizers.
Again it's all up to personal preference. Coming off of cigarettes I didn't care or even think about the vapor production - or clouds - but after a while I kind of just wanted it for some reason so I increased the VG, and also increased the nicotine level so I'd still get a throat hit since it gets weaker the higher you go into the VG side. If your throat hit and vapor production are already working for you then there's no reason to even try any other way. I'm not huge into wanting a tremendous amount of flavor so the higher VG works for me. I just re-read your post and to answer your other question, yes - vaping at higher wattage is going to run your coils down faster, but again, I don't drop below 70 and I'm still getting 2-3 weeks out of one, so hopefully that kind of answers that for you. The type and quality of your juice also factors into that too, but that's kind of a whole different topic. I wouldn't be too concerned with your coils seeming like they're pretty much the same. If I were you I'd use one for a month or two and then use the other for another month or two and see which one works best for you. In vaping, it's all about personal preference and there really is no straight answer to anything. Find what works for you and vape on
