500pp FF usually hits 7:10 to 7:15 for me. I can see just under 7 min with enough laps and good driving. I could certainly see 15 to 20 seconds gained with SRF. 500pp FF 6:45, yeah right. Most probably fully done up & with SRF, or Active Steer.
However that's life with GT5 no way to tell if SRF or Active Steer is on with certainty, this is applicable to every time ever posted by anybody ever.
Active Steer is the one nobody suspects, everybody usually thinks SRF when times are too quick, but active steer is more concealed, at times can cut substantial amounts off lap times.
Active Steer + Wheel = just as bad as SRF, but when analyzing a replay just about impossible to tell if it's in use.
For me this kills a part of GT5. All they need are indicators like TCS & ASM. I don't care if they are in the game, I want there use indicated in the replay, otherwise there is no certainty they are not in use, this includes times from the fastest D1, WRS, GT, doesn't matter. Not saying they use it but it's impossible to tell if they are or not.
Doesn't really matter since most people use ABS anyways... That's just another assist, and allows unrealistic driving techniques, makes braking effortless, the opposite of reality...
It's become pointless to get frustrated over a faster time.