One slightly thing, dont know if its wanted or just a bug: when you cruise it drains your energy, that we know. But when you EK it doesnt start to recharge; energy just loads when you hitted thruster (so you drop down to 200m/s, instead of keeping you 350m/s from cruise).
Else...
WOOHOOO!
No, it's not a bug. It's to prevent PvP abuse.
Energy consumption is relative to your speed, Ghost, not the fact that cruise is active.