The champions have won just seven times at Old Trafford under David Moyes but boast the most points accrued away from home in the Premier League this season.
The midfielder netted twice in an easy win for David Moyes' men at St James' Park, curling home a free kick six minutes before the break and then slotting home from Chicharito's pass in the 50th minute.
United has claimed more points away from home than any other team in the top flight this season, but its home form has been disappointing with just seven wins at Old Trafford.
"When we look at that record, we think we should have done better at home and at Old Trafford," Mata told MUTV. "But I think it is something to be proud of, to be the best team away from home in the league.
"Let's try to win at home, win as many games as we can until the end of the season and go higher in the table."
United hosts Norwich City, Sunderland and Hull City before the end of the season.