Yes. You need at least a +15% mana bonus to make a fast hero charge in 7 tiles matched instead of 8:
And you can bring that number down with the emblem node of certain classes too.
So you either need:
- Level 29 troop
- Level 23 troop + emblem node 8 / 19 (Ranger & Rouge / Barbarian, Cleric, Fighter, Paladin & Wizard respectively)
- Level 17 troop + costume bonus OR emblem node 20 (Druids, Monks and Sorcerers only)
- Level 11 troop + costume bonus + emblem node 8 / 19 (Ranger & Rouge / Barbarian, Cleric, Fighter, Paladin & Wizard respectively)
- Level 5 troop + costume bonus + emblem node 20 (Druids, Monks and Sorcerers only)
Do keep in mind any mana delays and mana reductions though, which can throw off these numbers.