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The article avvelenamento linked talks about how a big, low-revving V8 could be more fuel-efficient despite having more displacement---lots of torque, low revs. The engine doesn't have to be a lot physically bigger, and if is stressed less, it doesn't have to be super-robust.
A slight wait increase and a significant efficiency increase sounds like a winner. One wonders though, how much torque would be too much, and how the rear tires would fare?
Another possibility would be a short-stroke V8, with the Hybrid motors doing all the low-end pulling, with the petrol motor almost free-wheeling, then using ther petrol motor gently for most of the lap and jamming it full on down the straights for a boost in top speed.
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