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Championship leaders Porsche has fought back against Audi in the final free practice session of 2015, with the trio of Mark Webber, Brendon Hartley and Timo Bernhard taking top spot honours ahead of qualifying.

Despite suffering a rare blip in FP2, where the #17 Porsche 919 Hybrid lost half a second under the lights, Webber and company have roared into action with an impressive 1m 40.917s - over 1.1s up on its nearest rival, the sister Porsche machine.

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Audi failed to build on the momentum created from Friday and in an opposite trend to its German manufacturer rival ended up going backwards in daytime conditions, whereas Porsche suffered under the stars.

With both teams running varying strategies during free practice ahead of Saturday's season finale showdown, it sets up an intriguing battle in which the #7 Audi R18 e-tron of Marcel Fassler, Benoit Treluyer and Andre Lotterer needs to overhaul a 12-pont deficit to the #17 Porsche.

The sister Audi driven by Lucas Di Grassi, Oliver Jarvis and Loic Duval ended the session fourth once again ahead of the pair of Toyotas.

In the intense battle at the top in LMP2, Signatech Nissan went quickest ahead of title contenders KCMG and the pair of G-Drive machines.

It was a similar story in the GTE Pro class with Aston Martin fighting back against the dominance of Ferrari, as Alex Macdowall, Fernando Rees and Richie Stanaway lead a Aston 1-2-3.

The British manufacturer also claimed top honours in GTE Am, with Francesco Castellacci, Roald Goethe and Stuart Hall edging the Ferrari F458 Italia of Victor Shaytar, Andrea Bertolini and Aleksey Basov by 0.3s as the chequered flag fell on the session.