pedal stack height

So I've adjusted my seat height to compensate for the decrease in pedal stack height which from what I can figure is about a cm from the old look to the new time. It was a bit of effort to figure this out, aside from measuring it and going to speedplay's website. I even found one post about a guy who did a similar switch and claims to have lowered his 15 mile time trial time by one minute, just from more efficiency. I'm a bit skeptical about this ... but if it is true I should just attack next Tuesday night and solo lap the field seeing I can ride 15 miles at the field's pace and stay about the same distance ahead of the field (providing I was riding all out). Therefore since it only takes about a minute to lap the field at Rentschler I would therefore lap the field, because of the pedals ... right? Yeah, riiiiiggghhhht. It's nice to dream though.