McLaren's appeal is a joke. It seems clear now that the FIA have absolutely no way of policing article 6.5.5 so to punish BMW or Williams would be impossible.
In any case, the FIA have pushed themselves into a corner with their ridiculous judgements that if you break the rules but don't gain advantage then you don't deserve punishment. Even if the temperatures of the fuel reported were true, there's no way that would have given them 'significant advantage', therefore the FIA shouldn't punish them, according to their absurd precedents.
I was hoping that Ron Dennis would take it like a man and move on, but apparently not. Having said that, I shouldn't discount the possibility that the appeal was demanded by Mercedes or the sponsors.