I didn't have any LR DCs in front of me at the time I first did this (copied from a Vapatron post).
DC = Dual coil, SC = Single Coil
From my LT (w/ a Panasonic CGR18650CH 2250mAh batt, not fresh):
Set to Voltage, Measured voltage under load, Calculated static amperage--
Using 3.0 ohm DC carto/tank:
set 5.4v, 5.6v, 1.87A
set 5.5v, 5.7v, 1.90A
set 5.6v, 5.6v, 1.87A
set 6.0v, 5.8v, 1.93A
2.7 ohm DC carto/tank:
set 4.2v, 4.26v, 1.58A
set 4.5v, 4.6v, 1.70A
set 5.0v, 5.1v, 1.89A
set 5.3v, 5.3v, 1.96A
set 5.4v, 5.4v, 2.00A
set 5.5v, 5.4v, 2.00A
set 5.6v, 5.4v, 2.00A
Using 2.0 ohm SC carto/tank
set 4.0v, 4.02v, 2.01A
set 4.2v, 4.24v, 2.12A
set 4.3v, 4.34v, 2.17A
set 4.4v, 4.5v, 2.20A
set 4.5v, 4.6v, 2.30A
set 4.6v, 4.7v, 2.35A
set 4.7v, 4.7v, 2.35A
set 4.8v, 4.8v, 2.40A
set 5.0v, 4.8v, 2.40A
PS: The LT now has a fresh batt in it and I just threw the 1.25 ohm DC on the LT and set to 3.8v it will do 3.61v under load. 3.61v was as high, under load, as it would go. I popped the fuse in my multimeter last night so I can't double check the carto resistance as this comes out to 2.88A which seems way too high to me. So, even if the carto is now up to 1.5 ohms (it is getting on) that's still 2.41A and a warm vape. I ended up dropping the set voltage to 3.5v and got 3.45v under load and that was a better vape for me with the KBV RCT that's in it.