He has been given a rating of 119 for Saturday's performance, the same as he registered in the QIPCO 2000 Guineas over a mile at Newmarket in May.
The previously unbeaten Aidan O'Brien-trained colt, who was attempting to become the first Triple Crown winner for 42 years, got to within three-quarters of a length of the winner, Encke, who was given a career-best rating of 120, up from his previous best of 112.
After a slow early pace over the extended mile and three-quarters trip at Doncaster, Camelot failed to find the acceleration that he had shown when running away with the mile and a half Investec
Derby at Epsom in June.
On that occasion, he registered his career-best performance rating of 124.
As well as having put up the second best performance in a Long Distance race in the QIPCO British Champions Series this season, Camelot has achieved the third best Mile performance so far (behind Frankel and Excelebration) and the joint fourth-best Middle Distance performance (behind Frankel, So You Think and Nathaniel and tied with Farhh and St Nicholas Abbey).
Encke now heads the Long Distance performance table from Camelot with the Gold Cup winner, Colour Vision, who ran below his best in Friday's Stobart Doncaster Cup, in third.
Runner-up, High Jinx, ran to the same 111 rating in both races.
Camelot's second place on Saturday enabled both Aidan and Joseph O'Brien to increase their leads in the Trainer and Jockey of the Series tables with six races to go - the Nayef Joel Stakes in the mile category at Newmarket on Friday 28 September and the five category finales on QIPCO British Champions Day at Ascot on Saturday 20 October.
QIPCO BRITISH CHAMPIONS SERIES LONG DISTANCE PERFORMANCE TABLE (after 6 races)
NOTE: To qualify for entry into the Performance Tables, which use BHA performance ratings , a horse must finish in the first three in a QIPCO British Champions Series race. Performance ratings may retrospectively be changed if the handicappers revise their ratings for a race in the light of subsequent results.
TRAINER OF THE SERIES (AFTER 29 RACES)
1 Aidan O'Brien
2 John Gosden
3 Sir Henry Cecil
4 Saeed bin Suroor
5 James Fanshawe
JOCKEY OF THE SERIES (AFTER 29 RACES)
1 Joseph O'Brien
2 William Buick
3 Tom Queally
4 Frankie Dettori
5 Ryan Moore
Points are awarded on a 20-10-5 basis to the jockeys and trainers of the first three horses in each QIPCO British Champions Series race. In the event of a tie, the number of winners (and, if necessary, second places) will be taken into account. The Jockey and Trainer of the Series will be presented with a specially commissioned trophy on QIPCO British Champions at Ascot on Saturday 20 October.
The remaining QIPCO British Champions Series races are: