The same margin Turnbull achieved in the 2016 election.Although the LNP gains 6 seats and ALP 1 and IND 1
How does that work?
Whoever made that claim is confused and is mixing different statistics together.
The Coalition has won six seats which they did not hold before the election (Braddon, Chisholm, Herbert, Lindsay, Longman, Wentworth).
However, two of those seats were Coalition seats after the 2016 election which went independent in a by-election (Wentworth) or when the MP resigned from the party (Julia Banks in Chisholm). So that brings the gain down to four, compared to the 2016 election.
The Coalition also lost four seats - one just a normal marginal seat lost (Gilmore), two lost to redistribution (the Victorian seats of Corangamite and Dunkley) and of course one ars€-kicking (Warringah). So that takes the gain down to zero.
The Liberal candidate is leading in Bass which is still within 0.5%, so if they win that they will get 77 seats in total, a gain of one (not six) from the 76 seats won in the previous federal election.
Labor has won three seats (Gilmore, Corangamite, Dunkley), lost four seats (Braddon, Herbert, Lindsay, Longman) and won the newly created Victorian seat of Fraser (whoever proposed a new nominally safe Labor seat be named after Malcolm Fraser has a good sense of humour). If they lose Bass, this will leave them with 68 seats, a loss of one (not a gain of one) from the 69 seats won in the previous federal election.Independents had a gain of one compared to the 2016 election - Zali Steggall winning Warringah from Tony Abbott.
Other seats which were held by independents from the 2016 election stayed that way: Andrew Wilkie (Clark, renamed from Denison) was returned with a positive swing, while the seat of Indi was won by Helen Haines after the retirement of Cathy McGowan - a historic result as this was the first time an independent had been succeeded in the same federal seat by another independent.
Greens, Katter and Centre Alliance each held the one seat they had before, and each with a positive swing.