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OVA
Sonic’s base speed rating is listed as Subsonic (75.236681 m/s) while his Super Peel Out supposedly amplifies his speed to Massively Hypersonic (121,840.767 m/s), meaning his SPO is 1619x greater than his base speed. Of course this gargantuan gap isn’t at all supported by the film.- Tails, who is scaled to Sonic’s base speed, moved in tandem with Sonic while he was using the Super Peel Out, arriving in Robotropolis closely behind Sonic. If Tails were 1619x slower he’d have been utterly left in the dust
- Hyper Metal Sonic revving his engine is treated as a speed amp that provides an equal speed to Sonic’s Super Peel Out. However, Sonic explicitly reacted and jumped out of the way when Metal Sonic charged at him after revving his engine without the use of his SPO, concretely proving Sonic’s base speed should be MHS (at least Reactions-wise).
- Sonic does this again later in the fight while in midair (where it’s impossible to use his SPO as noted by his profile)
So overall, Sonic’s base speed should be Massively Hypersonic, being at least somewhat in league with his Super Peel Out and Metal Sonic’s “Revving”
Promotional Comic speed
Speed: Varies from Subsonic+ for normal speed (Mach 0.81428; Smashed 3 badniks before the pieces fell to the ground) to at least Transonic when revving up (Mach 1.00356; Continued increasing his speed till he accidentally broke the Treadmill by smashing the Sound Barrier. Implied he never tried to speed himself up that fast before as it turned him blue)
He should just have a flat Transonic rating. Sonic’s speed doesn’t vary nor is “revving up” something that amplifies his speed, it’s just acceleration. He’s not “increasing his speed”, it just takes him time to reach his top speed.