* Average speed over a lifetime: This would be very low, considering time spent parked, idling, and in slow traffic. It might be only a few miles per hour.
* Average speed on a highway: This might be 60-70 mph (97-113 km/h) in many places, but could be lower depending on traffic, speed limits, and location.
* Average speed in city driving: This would be significantly lower, perhaps 20-30 mph (32-48 km/h), due to stop-and-go traffic and lower speed limits.
* Average speed on a specific journey: This would vary wildly depending on the route, traffic conditions, and the driver.
Therefore, any number given as an "average speed" would be highly misleading without specifying the conditions.
