We are not that good as a team to win games away. That is the reason. TH did good job with the team he has, and he obviously don't believe too much in players out of first 11 + a 2-3 more, so with playing them every 3 days we had to have problems with energy levels. That is one of the reasons, for sure, and there is plenty of more, but I think that key reason is that we are not good enough.
All the games that we won, we have to fight till the end to win. From what I can remember, we won only 1 or 2 at home comfortably, without fighting till the last minute to keep win. I think it was Leicester at home, and maybe one more. Usually we win by 1 goal, or 2 but with late second one. So, we are not beating teams easily. So, when we play away, I guess home team will give 10-20% extra with fans around, and those 10-20% is enough for us to fail.
So, while our results are good overall, especially at home, and probably better than thought it will be in the first year of TH in charge, we are not that strong as you could suggest by checking league table only.
When you check other results, you will see that even Newcastle who had a lot of draws, had a lot of wins in which they got easy win with 3 or 4 goals margin. And it is not just cause of fatigue, as we've been the same at the start of the season and before WC