Although this story relates to F1, how likely do you think it is the ACO will return to a fuel efficiency formula, further improving it's green credentials?
Personally I'd like to see manufactuers push the limits of fuel efficiency in P1, while GT2 would be very interesting as restrictors could be ditched and we'd see which manufactuers have found the best performance/efficiency balance.
At the very least it would be interesting to see how a current P1 compares to a last generation Group C car in terms of fuel consumption.
http://www.autosport.com/news/report.php/id/83210