Even if no-one else seems to be interested in this, I gathered a table of the engine usage on this season up to now using the FIA technical reports I could find (I didn't find Malaysian or Spanish report, so had to guess based on the usage information on other reports):

So, with 9 GPs completed and 8 to go we can see that Kubica has used 6 engines (and driven already 2 GP's with his 6th engine) and the Toro Rosso boys have only used 4 engines each with both only having 1 GP to them.
To me it looks that Kubica, Trulli & Glock at least will be having trouble in the later part of the season to keep the usage in the 8 engines. Toro Rosso & McLaren have been the easiest with their engines.
【重点】 Also "car breaker" Kimi has used one engine less than his team mate up to now.