MTL is very juice efficient when compared to DTL. One major contributing factor is MTL tanks/atomizers operate generally in the 1.0 to 1.2ohm resistance or higher rating with thinner wire, generally 28awg or thinner, which has less metal mass and more resistance per foot than thicker wire, this accounts to MTL devices needing less wattage, generally in the 8 to 18watts range, and 18 to 20 watts at the high end for most MTL would be needing a very loose air flow, almost a restrictive DTL airflow (think the Kanger Sub-Tank/Top-Tank line). Less watts = less juice consumed, the flip side to that, to keep your nic cravings under control if using nic, as example stepping down from DTL, if you are using 3mg nic/ml at hypothetically 45watts or so, even running in the average ball park for MTL at 10 to 12 watts median average, 45watts/10watts=4.5, 3mg X 4.5 = 13.5mg/ml or close to that nic level in your liquid would be needed, most liquids off the shelf you can find a 12mg/ml. I float between MTL and DTL, though most my day is on MTL devices, I have to use 2 different techniques, DTL is straight DTL rapidly of about 6 to 8 seconds, then breathe out my nose in a single firing hit, MTL I've adjusted to a double hit, draw one hit into my mouth slowly at about 5 seconds, inhale letting off the fire button, then breathe out through my nose while firing a second hit slowly of about 5 seconds again and breathe out though my nose again. Most mods will cut out firing, firing time out, at around 10 to 15 seconds depending on the firmware, generally 10seconds, it is just how I adjusted to the mod firmware time out limits of most mods.
Firing without drawing, not advisable, if just a couple seconds, you'll not see any adverse affects, first hit when you do draw immediately after such a firing will be a bit warmer than normal, but if you fire and hold, if the mod doesn't time out, you'll scorch your wicking as said above.
