Average gap to Pole Position
Every Pole Position matches to 100%, the gap is stated as a value in percent, because it's more exact as the gap in seconds, because the different length of the tracks. All Indy500 races are excluded from this statistic, because their qualifying rules differ to much from the rest of the Formula 1.

Engine     # 1 Mécachrome 1,750%   2 Playlife 2,179%   3 TAG 2,207%   4 Supertec 2,312%   5 Renault 2,319%   6 Lancia 2,336%   7 Honda 2,365%   8 Toyota 2,394%   9 Peugeot 2,408%   10 Petronas 2,419%   11 Ferrari 2,476%   12 Vanwall 2,732%   13 BMW 2,777%   14 Matra 2,792%   15 Mugen Honda 3,173%   16 Cosworth 3,482%   17 Mercedes-Benz 3,498%   18 Acer 3,681%   19 Weslake 3,948%   20 BRM 4,075%   21 Fondmetal 4,094%   22 Arrows 4,114%   23 Pratt & Whitney 4,116%   24 Serenissima 4,233%   25 Ford 4,247%   26 Tecno 4,446%   27 Repco 4,610%   28 Alfa Romeo 4,642%   29 Asiatech 4,702%   30 Climax 4,898%   31 Yamaha 4,927%   32 Megatron 5,217%   33 European 5,401%   34 Lamborghini 5,491%   35 Aston Martin 5,724%   36 Hart 5,759%   37 Judd 6,024%   38 Porsche 6,119%   39 Maserati 7,406%   40 Zakspeed 7,675%   41 Küchen 8,478%   42 Castellotti 8,567%   43 Ilmor 8,832%   44 Gordini 9,538%   45 Platé 9,636%   46 A.T.S. 9,729%   47 Osella 9,916%   48 ERA 10,055%   49 Scarab 10,319%   50 Bristol 11,693%   51 Lea Francis 11,777%   52 Milano 12,126%   53 Alta 12,614%   54 Bugatti 12,980%   55 OSCA 13,356%   56 Talbot 13,586%   57 Borgward 13,726%   58 Motori Moderni 14,006%   59 EMW 16,839%   60 Veritas 18,350%   61 Offenhauser 24,333%   62 Jaguar 26,981%   63 Speluzzi 29,511%   64 Butterworth 50,512%   65 Life 89,986%   66 Subaru 197,716%   67 De Tomaso 277,080%