Yes, for teams beaten/teams possible to beat, T/V have the best record among winners (78%), ahead of BJ &Tyler and Nick & Starr. Eric & Jeremy still have the best record ever (86%), but they didn't win.
Some stats...
If you assign a number of points (3 for 1st, 2 for 2nd, 1 for 3rd) and divide by number of legs:
Tammy/Victor 2.1
Nick/Starr 2.0
Tyler/James 1.8
BJ/Tyler 1.8
Rob/Brennan 1.7
Linzes 1.6
Zach/Flo 1.5
Chip/Kim 1.5
Chris/Alex 1.4
Chip/Reichen 1.4
Uchenna/Joyce 1.3
TK/Rachel 1.3
Freddy/Kendra 1.1
Eric/Danielle 0.8
But the super-geek at Tarflies felt this was the best indicator: # of teams beaten divided by # of teams possible to beat (considers non-elims)
Tammy/Victor 78%
BJ/Tyler 75%
Nick/Starr 74%
Tyler/James 74%
Rob/Brennan 72%
Zach/Flo 71%
Linzes 63%
Chip/Reichen 62%
TK/Rachel 61%
Uchenna/Joyce 60%
Chip/Kim 56%
Chris/Alex 54%
Eric/Danielle 52%
Freddy/Kendra 43%
And some teams who made it to the final three but didn't win:
Eric/Jeremy 86%,11% better than winning team
Rob/Amber 74%, 14% better than winning team
Colin/Christie 73%, 17% better than winning team
Frank/Margarita 72%, Same as winning team
Kris/Jon 67%, 24% better than winning team
Margie/Luke 71%, 6 %worse than winning team
Rob/Kimberly 65%, 9% worse than winning team
Ron/Christina 56%, 5% worse than winning team
Bransens 52%, 11% worse than winning team
Ken/Tina 71%, 3% worse than winning team.