Sure. There's an optimal tire pressure for each tire, and the wider the tire, the lower the pressure. The point I was making was that a wide tire at optimal (lo

Sure. There's an optimal tire pressure for each tire, and the wider the tire, the lower the pressure. The point I was making was that a wide tire at optimal (low) pressure is not significantly slower than a narrow tire at optimal (high) pressure. However, any particular tire can be underinflated relative to its optimum, and become sluggish.