History of car gas mileage

Along with each car, learn the city and highway MPG, engine size, transmission type and other fun facts. To find out more information about the following high mileage cars or to look up the fuel mileage of your own car, go to fueleconomy. This two-seater was the first hybrid car in the United States, beating the Toyota Prius by 7 months. This is the third model of the Prius sold in the United States, and unlike other high fuel mileage cars, it does better in the city then on the highway. Get the inside scoop on what makes this model differ from previous versions by reading Plug-In Prius Test Drive.

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This lightweight Chevrolet was a Sprint with additional features, such as a light indicating the ideal time to shift. This Geo Metro aimed for high fuel mileage, but deleted amenities such as the passenger mirror in the process. The HF stands for High Fuel economy, and that is exactly what Honda wanted from this coupe, nearly a decade before hybrids were introduced. Another Honda Civic makes the list. Honda has a long history of mileage, check out Honda's High Mileage Club to learn more. That is because this car was only sold in Canada and the Middle East from to Photo by Alden Jewell.

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S market. Interested in how hybrid technology works? Check out How Hybrid Cars Work to learn how gasoline and electicity power this vehicle. Learn more about these new hybrids from Ford and about the tax credit in New Hybrid Sedans from Ford. Because of the original statutory authority, GHG standards can essentially be set indefinitely; however, NHTSA can only make final rules on fuel efficiency for 5 consecutive model years.

Because of this, the current CAFE standards are only final through model year , with the standards for proposed referred to as augural but not finalized meaning they have no enforceability. Because of the different time scales a midterm review was ordered to assess the feasibility of the augural standards.

A timeline of changes in automotive fuel economy | Grist

The review was completed shortly before Obama left office and indicated that the augural standards were appropriate. These finding were challenged by the Trump administration which used a separate review as justification for proposing SAFE.


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However, Phase II introduced a number of alternative compliance measures that could partially reduce that fuel economy standard by approximately 6 mpg. Under the final rule, NHTSA estimates that with the alternative compliance measures, the average combined fuel economy standard in , would be closer to Going deeper into the complex regulatory structure, the CAFE standards further vary for each vehicle based on size, beyond the passenger car and light truck dichotomy.

In order to incentivize automakers to meet the standards in ways other than shrinking the size of a car, the CAFE standards vary based on the area of the undercarriage calculated as the length from axle to axle and width between the tires. Based on this area, a particular car model must meet a given mpg standard per model year See Figure 1 below for the curve example.

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Part of the reason automakers were supportive of the stringent standards set by the Obama Administration, was the goal of creating one national standard. Because of the statutory authority given to NHTSA to regulate fuel economy standards, it would take a legislative act to change some of these authorities to truly harmonize the two set of standards.

Even considering all of these credit removals possibly requiring 6 mpg of actual fuel efficiency gains , Alternative 3 is still lower than the CARB and CAFE standards in all respects and Alternative 7 would have a lower car mpg and would almost equal the light truck standard. The CARB values increase by 3. Alternative 5 PA5 has the same increases as PA4, but they are delayed by one year, beginning in model year instead of Alternative 8 PA8 has the same increases as PA6, but they are delayed by one year, beginning in model year instead of Numbers were extrapolated back from final, using average increase of 3.

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Using the calculated MPG values above, as a thought experiment, I modeled each scenario to determine potential GHG emissions over the lifetime of the fleet Figure 2. To put the numbers in context, the SAFE proposals would likely contribute to teragrams Tg of greenhouse emissions over the lifetime of the combined fleets estimates of annual U.


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GHG contributions are approximately Tg from all sectors. Current fleet sales have a large effect on potential GHG emissions.

10 tips that will improve your car's fuel economy for free

Current transportation sector GHG contributions are just over Tg from on road sources and Tg from all light-duty vehicles. Instead of focusing massive amounts of effort on which proposal to choose, there is clearly room to compromise and negotiate. They could also take this opportunity to accomplish something all parties strive for — a truly harmonized fuel economy standard that allows for clear standard compliance. On October 10 and 11, nearly 2, global city leaders from the public, private, and civic sectors gathered in Copenhagen, Denmark, for the