{
 "formula": "road_load_power_w = rolling * mass_kg * g * cos(grade) * speed_mps + aero * speed_mps**3",
 "rolling": 0.011932077183171142,
 "aero_kg_per_m": 2.7376895505031347,
 "g_mps2": 9.8,
 "grade": "road_grade_pct / 100",
 "fitted_on": "the whole 428 km log the published stretch came from, by least squares (no intercept) on the moments the truck was driving rather than braking; R^2 0.74 on a held-out 30%"
}