See your top rate
Gas mileage usually peaks at a rate of 40-55 mph (64-89 km/h) while using your cars top equipment. It can vary significantly between automobiles based on weight, engine, the gearing and drag, but following 60 miles it declines appreciably. Recent research by the Oak Ridge National Laboratory comparing 74 vehicles' fuel economy at speeds of 50, 60, 70 and 80 mph indicates each extra mph reduces fuel economy by roughly 14%. More simply put, from 50 to 60 mph fuel market drops by 12%, from 50 to 70 miles it drops by 25%, and from 50 to 80 miles it falls by 36 percent. If you are a bit of a lead foot slowing down can improve your fuel economy. Clearly you can only go as slow as is secure, but by cutting 10 mph, dividends can be paid and will probably make your smoother also.
