I think you meant, .025g, eh?
I went from a long time (over 4 years) PD user to the LSV fairly recently. I did this for a few reasons. One, is that fucking stickstones was fanboying the LSV so much, I had no choice. Secondly, and just a tad more seriously, my PD was on it's last legs and was running wayyy too hot (abv coming out black), that I needed to get another vape. I have a second PD that I only used about 4 times that I guess I could have put into use, but after reading all of the glowing reports on the LSV, and after using the PD exclusively for over 4 years, I wanted something that would provide a new experience. I also hit the PD exclusively through my mini-beaker so the LSV seemed like a REALLY good option.
Ok, now regarding efficiency, here's the deal. I can load up a PD stems worth in the LSV's WPA and get two very solid hits, which in strength, equals the 5 hits that I was able to get out of the PD's stem, so in this respect, the LSV is as efficient as the PD. But here's the rub. Being that I can get such a HUGE, TASTY hit from the LSV, I have found that I am using a bit more bud, and therefore, getting a bit higher than I used to get with the PD. This will cause my tolerance to increase and therefore, efficiency will begin to suffer unless I dial it back a bit and take smaller hits, or go on more frequent one or two day t-breaks.
I only vape once in the evening every night, and with the PD, I'd go through from 3/4 of a stem to one stem. I am now loading the LSV's WPA with about 2 1/2 to 3 PD stems worth and it is lasting me about 2 1/2 to 3 nights. I feel that I am using a little more bud with the LSV, but not much more, at least that's the way it is now.
Regarding using it at the highest setting, I have found that I go into combustion at anything over 2:00, regardless how much I have loaded up the LSV. No need to go that high.
Can you use the LSV doing just one micro hit per session? Absolutely. Will you? That's debatable, considering how good things taste and how much fun it is to use, especially when hit through glass.
Taking a micro-hit from an LSV is like putting around in a Hennessy Viper at 30mph on an deserted freeway.