The Suzuki rider recovered from 11th on the grid to run strongly inside the highest six early within the race and was operating tempo that threatened a podium cost.
However whereas teammate Alex Rins went on to safe second, Mir pale to ninth on the chequered flag as he encountered a problem along with his smooth entrance tyre.
With Quartararo profitable in dominant trend, his championship lead over Mir now stands at 65 factors with a provisional six races left in 2021 – main Mir to confess his title defence is now probably over.
“Sure. It’s not achieved till the chequered flag, that is clear. However yeah, I’m disenchanted about in the present day,” Mir stated when requested by Motorsport.com if the championship was now out of attain.
Later requested how his title problem ended up on this place, having solely scored 4 podiums in 2021 in comparison with Quartararo’s 5 wins, Mir added: “I anticipated to be nearer truthfully and to have the ability to get extra podiums this season.
“We bought a few fourth positions that couldn’t be some podiums.
“However effectively, truthfully in the present day I’m probably not optimistic as a result of what occurred is absolutely unusual and one thing that occurred in the present day for me shouldn’t be clear.
“So, we’ve to grasp.”
Mir made a late change to the smooth entrance tyre on the grid forward of the 20-lap Silverstone race, with the cooler situations forcing quite a few riders to do the identical.
However the Suzuki rider doesn’t consider his entrance tyre points had something to do with the softer rubber, given Quartararo received the race on that very same choice.
“Nicely, the emotions truthfully on the primary laps have been actually good,” he defined.
“I used to be capable of trip in a great way and to be within the place that I wished for the top of the race.
“However I had an issue with the entrance tyre. This drawback was making me lose two, three seconds on the final 5 laps and quite a bit from 10 laps until the top, or 12.
“I had this drawback that earlier than I didn’t have and we’ve to grasp.
“I used to be racing with the smooth. Nicely, I’m unsure it’s an issue of the tyre selection as a result of the winner was utilizing this tyre and I used to be capable of work quite a bit on this tyre and one thing comparable by no means occurred to me.
“So, we’ve to grasp.”