There really is no simple answer to this question, depends on the vehicle, how much weight you are carrying, etc. Obviously you should not exceed the posted speed limit simply because your car gets better gas mileage at a higher speed. The thing that most impacts fuel mileage is where and how you drive. Stop and go traffic is going to consume more fuel than constant speed highway driving. Gradually coming up to speed will use less fuel than stomping the accelerator pedal to the floor each time you pull away from a stop sign or traffic light. Changing the way you drive would probably have a greater impact than changing the speed at which you drive. The difference between driving 60 mph and 70 mph may only make a small impact on fuel economy depending upon how your vehicle is geared. Stick shift cars also tend to get better fuel economy than automatics in most cases. There was an automatic transmission known as a CVT or continuously variable transmission that was available on some Honda and Audi vehicles which improved on the fuel economy slighlty.
This question is actually quite complicated. Cars vary in size, horsepower, engine size, and fuel efficiency. These factors and others all go into determining optimum speed. For most cars, the “sweet speed” is between 40 and 60 mph.
How you drive also figures into how efficient your vehicle is. Constant stopping and starting uses more fuel than gradually decelerating and accelerating, while driving at a continuous speed uses less fuel than changing speeds.
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