In general, however, it is generally accepted that the most efficient speed for most cars is between 50 and 60 miles per hour (mph). This is because at these speeds, the engine can operate at its most efficient RPM range, and fuel consumption is minimized.
However, there are some exceptions to this rule. For example, for some hybrid vehicles, the most efficient speed may be lower, while for some trucks and SUVs, the most efficient speed may be slightly higher.
Ultimately, the best way to determine the most efficient speed for your specific vehicle is to consult your owner's manual or to experiment with different speeds to see what works best.
