Hey, how's it going lol
I would assume so, yes. In all related versus threads either through here or outside like at animevice or spacebattles or even just on calc's like from the OBD that i've seen and/or can recall/remember, nobody ever mentions this aspect of lightning. So the verse in question may have to mention it specifically like Tengu's case for it to be used...at least that's how i see it.
For Tengu again in his case here...ehh, idk. I think it's supposed to be Mach 30k according to what the author put. Even the Toriko wiki on his page mention/note it to be just Mach 30k, which is odd from what i've seen otherwise of an IRL RS (Return Stroke).
Here:
"Brunch has the ability to generate and control large amounts of electricity. It is strong enough to completely incinerate the Gourmet Corp.'s Beasts, and even scorch and stun Elg, hinting it would be fatal to the latter if he were not immortal. Brunch's body contains electricity-producing organs like an electric eel, but each of his cells also act as amplifier circuits. He can produce over 100,000 amperes of electricity with an average potential of 100 million volts, rivaling the power of a lightning bolt. Since the time needed for discharging it is only 0.1 seconds, his attacks are virtually unavoidable. When preparing a long-distance attack, he first makes the path in the air, the Stepped Leader (ÕàêÚºåµö¥Úø╗ (Òé╣ÒâåÒââÒâùÒâêÒâ¬Òâ╝ÒâÇÒâ╝) Sutepputo R─½d─ü), to lock on his targets, then unleashes the offensive discharge, the Return Stroke (Õ©░ÚéäÚø╗µÆâ (Òâ¬Òé┐Òâ╝Òâ│Òé╣ÒâêÒâ¡Òâ╝Òé») Rit─ün Sutorōku). While the first part goes at the speed of 200 Km/s (Mach 600), the second is much faster, traveling at 10,000 Km/s (Mach 30,000)."
Edit: I would assume that the author might have been a number off of the Return Stroke speed part.