Sonic's Speed[]
Sonic Unleashed shows that the Light Speed Dash clocks in at 385 SPD in the checkpoint speedometer. Sonic moving at his fastest within Unleashed clocks in at 4399 SPD. Let's do some simple math, and I mean incredibly simple. I don't think this even needs to be evaluated.
4399/385= 11.425974026
11.42x FTL, which is FTL+.