Yes it seems that Teddy's 80% completion rating in last Saturdays game against the Cards is indeed a team preseason record for QB's taking at least 20 snaps. Also his QBR of 136.9 ranks as the teams second best.
I know its early but it is sure good to see that Teddy is already breaking records even if it is just the preseason. Lets hope this is the first of many more to come in his long career with the Vikings.