See also:

Making adjustments in 1 mph (Canada:

1 km/h) increments
Briefly press the cruise control lever to the pressure point, up 1 for a higher speed or down 2 for a lower speed. The last speed stored is increased or reduced. ...

Normal occupant weight
The number of occupants the vehicle is designed to seat, multiplied by 68 kilograms (150 lbs). ...

Tread
The part of the tire that comes into contact with the road. ...