I remember back in 2009 (Maybe it started in 2008 - I don't quite remember) they published fuel weights of the Q3 cars. People would take away the minimum weight (which was 605kg back then) and then reverse-calculate how long each car could last before their first pitstops.
I'd love to see the same thing happen with tyres. See who's got how many new/used primes/options. Better yet, also publish how many laps have been done on the Q3 qualifiers' tyres