Below is a table of a selection of some tyres that are pretty fast and some that are very popular but much less fast. This data comes from independent tester Bicycle Rolling Resistance (bicyclerollingresistance.com) and it suggests a few interesting things. First, tubeless is speed king; second, in pure rolling resistance terms, higher pressure = lower rolling resistance; and third, construction and compound play a crucial role, as all other factors here are equal, even most of the tyre widths.
RR = Rolling resistance. Tests conducted on a rolling drum at tyre speed 28.8kmh, tyre load 42.5kg, internal rim width 17.8mm. RR med = 66psi (22-24mm), 60psi (25-27mm), 54psi (28-29mm); RR high = 88, 80, 72psi; RR extra = 110, 100, 90psi; RR ultra = 132, 120, 108psi…