What percentage increase in gas mileage do most vehicles achieve at 55 mph compared to 70 mph?

Vehicles typically experience improved fuel efficiency at lower speeds due to reduced aerodynamic drag and more efficient engine operation. Studies have shown that operating a vehicle at 55 mph can lead to a significant increase in gas mileage compared to driving at 70 mph. The commonly cited statistic is that most vehicles achieve approximately a 20% increase in gas mileage when driven at 55 mph instead of 70 mph.

This is particularly important for drivers to understand, as it highlights the benefits of maintaining moderate speeds not only for fuel savings but also for contributing to overall safety and reducing emissions. The increase in efficiency can be advantageous for both personal budgets and environmental considerations.