The gear ratio is the ratio of the output speed to the input speed such that an overdrive gear ratio of more than 1:1, having more speed per speed of engine rotation RPM
Overdrive ratios conditions is one where the vehicle wheels and speed is faster at a given engine rotation, such that there is fuel efficiency is increased as the engine rotation is low for a given speed and distance of travel.
The tiny ripples on the soup are not only similar to wind-generated waves ... they ARE wind-generated waves. This is a big part of the reason why they bear such an uncanny resemblance.
