Let's move the goalposts again I guess. https://www.wired.com/story/is-there-an-optimal-driving-speed-that-saves-gas-and-money/ https://www.wired.com/story/is-

Let's move the goalposts again I guess. https://www.wired.com/story/is-there-an-optimal-driving-speed-that-saves-gas-and-money/ https://www.wired.com/story/is-there-an-optimal-driving-spee... Even if your car is getting 45 mpg you shouldn't drive over 70mph if they want to conserve fuel/emissions, and if your car is getting a lower mpg rating than that you should be driving slower.