How to turn off mph in a car?

[McNaomi]

Car mph cannot be turned off because it is a unit of speed, representing "miles per hour." Generally, vehicles that use "miles per hour" as the speed unit are imported or joint-venture brand cars introduced for domestic sales, while domestic cars use "kilometers per hour" as the speed unit. If the owner drives a car with "miles per hour" as the unit, they need to pay constant attention to the speedometer; otherwise, it is easy to exceed the speed limit. One mile per hour is approximately equal to 1.6 kilometers per hour. Some imported cars that enter the domestic market through special channels have dashboards that display speed in "miles per hour," but most domestic cars use "kilometers per hour" as the speed unit.