Formula One is still heading towards 1000bhp engines in 2017, although discussions will continue following yesterday's Strategy Group meeting.
The F1 Engine Group is exploring how a relaxation of the limits of fuel flow, and the maximum amount available for the race, can best be adjusted to improve the show and make the sport more appealing for the fans.
Major changes to bodywork and the introduction of wider rear tyres remain in the table for 2016, and F1 supremo Bernie Ecclestone is understood to have said that Pirelli would be able to deal with the latter, despite earlier suggestions that the Italian company would prefer to wait.
One of the key focuses of the current research is what the cost implications are for the teams, given that any rules changes involve extra expense.
"That's what they are looking at now," said one source. "One of the failings that we've had before is that it's always been engineering driven, and now it's going to be an engineering desire, but cost driven.
"It's 2017, the question is can it be brought forward to '16?"
All the big players were at the meeting, including Ecclestone, FIA president Jean Todt, Toto Wolff and Niki Lauda (Mercedes), Ron Dennis and Eric Boullier (McLaren), Sergio Marchionne and Maurizio Arrivabene (Ferrari), Christian Horner (Red Bull), Claire Williams (Williams) and Bob Fernley (Force India).