Standard advice doesn't apply to the dual coil ones. Vape them at 3 volts, or take them to 8. Whatever you like, just remember they are technically rated at 1.5 ohms total, so that will kick the circuit protection in a lot of stuff if you go over 4 volts. (3.7 on provari, 4.5 on darwin, never on GGTS because there is no protection) might blow a 2.5 amp addapter also if you go 5 volts.
Its all about massive vapor, and flavor and TH right? haha