Hotter coil = more e-liquid vaporized per puff. The math is straightforward.

Most vapers use about 25–35% more e-liquid in boost mode compared with normal mode. For someone going through 3ml a day on normal mode, that's an extra 0.75–1.05ml per day on boost. Over a month, it adds up to roughly one extra 30ml bottle of juice.

The cost difference depends on what juice you buy. If you're on budget £10 bottles, boost mode costs about £3–£5 extra per month. If you prefer premium £20+ juices, it can add up to £10/month or more.