You are right that we have never tasted victory away from home. From 5 games away, Liverpool are only able to get 2 points from draws against Fulham and Everton in the Premier League.
Playing in London against Tottenham this week will be Liverpool's 6th away game this season and Liverpool will try as much as possible to get points and I don't think that is a difficult thing even though Tottenham will also be looking to win to secure a place in the table.
After you have made the right analyzes, you just concluded it with another thing. Liverpool fans should only just have hope that Liverpool will draw. Liverpool can not be underestimated and may win but the chance is very low and less possible than for Tottenham to win or draw the match. If I choose between the two clubs, I will choose Tottenham. It is obvious that you are a Liverpool fan, that has been the reason you noticed that Liverpool has been playing not impressively in away matches and yet you are supporting the club to win Tottenham.
Support is still with Liverpool for now and forever, but we also do not hesitate to admit that Tottenham is not an easy opponent to be defeated. For us it is a natural thing and not the intention of supporting the opposing club.
Although some of the observers gave an analysis that Tottenham was difficult to defeat because the team's appearance led by Antonio Conte was in the best performance, we were very optimistic that the victory at Tottenham Stadium would be the target that Liverpool would be targeted to win the first away match this season.
Arsenal don't have experience at top of table recent years and it is a big test for them. It is not easy to repeat the 2003 - 2004 season and it is hard to stay at the first position until the season ending. Arsenal of course should try to get as best result as possible from the derby. However, if they lose it, they will still have a lot of things to work.
About Arsenal's experience surviving at the top, it was undeniable. If they lose to Chelsea on the London derby, then Manchester City's position in the standings will be difficult to pursue again by Arsenal. This season is a good opportunity for Arteta to break the assumption of many observers who say Arsenal will not be able to maintain a position at the top after 2003-2004.