sorry double post!
i say split the bill. id hate to be sitting round with calculators adding up what people had consumed.
normally, if there is one person not drinking at all, then we'd take the food cost from them and split the rest between the drinkers. i think normally, if you're going out in a group tho, you know that the bill will be split each way, and you prepare for that. although i will say, €85 per head is a LOT.