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Pick two drivers in the same class and season.
Each measure from this page with the driver's rank in the class (1st is best). Green rows are in the top quarter of the class, red rows in the bottom quarter (needs four or more drivers with that measure).
Median difference between the two best laps in the heats both drivers ran each day. Bars left of zero are days — was quicker.
Gap % is a best lap divided by the fastest best lap in the same class in the same heat, minus one. Typical lap is the median of a driver's laps after the first, leaving out laps more than 7% slower than their best. Spread is the standard deviation of those laps; smaller means more consistent. Pace rank is where a best lap ranked in the class in that heat.
Wet or damp: lap times decide whether the track was slow (class fastest lap more than 3% off that class's typical fastest lap in the same direction), and rainfall says why. Wet means slow with at least 0.5 mm of rain in the three hours around the start; damp means slow with less rain. "Showers, track dry" means the weather model saw rain but lap times were normal. Weather comes from the Open-Meteo historical archive for the track's location, a grid several kilometres wide, so treat it as indicative.
Starts and passing use each lap's running order from Speedhive's lap data, reduced to the class. The grid is the class order of grid slots. Places changing hands through pit stops, retirements or penalties count the same as passes.
Most improved is the slope of a least-squares line through a driver's median gap on each race day, expressed per month. Holding pace compares the median of the first three and last three clean laps (within 7% of the driver's best), leaving out lap 1.