This is based on each driver's fastest lap in any part of qualifying, converted to a percentage from the fastest of all. If a driver didn't set a representative time at all his average is just taken from those races when he did: Other than confirming the very big gap between the big 3 teams and the rest, there were a few surprises: Grosjean's problems are all in races, not in qualifying After being outqualified in the first four races, Sainz has asserted himself at Renault Like Grosjean, Hartley is doing better in qualifying than races The biggest gaps between team mates are: Sauber 0.85% (very impressive for a rookie; Ericsson virtually dead-heated with both Nasr and Wehrlein) McLaren 0.45% (Vandoorne was 0.37% behind over the full season in 2017) Ferrari 0.32% (Despite all the - justified - criticism, Raikkonen was 0.36% slower than Vettel last season, so is doing no worse on this measure at least. For what it's worth, in 2014 Alonso was 0.44% faster than Kimi on average) Finally some food for thought for Williams. Last year Massa was 0.94% faster than Stroll - a wide margin. If that had been maintained this year, Massa would appear on this chart between Alonso and Gasly at -2.81%.