Hybrid Cars panamera-hybrid

Published on February 25th, 2011 | by Christopher DeMorro

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Porsche Panamera Emits Less CO2 Per Horsepower Than the Prius

When you’re on top, people will always try to take you down. Since the Prius is one of the most fuel efficient cars in the world, it makes for some interesting comparisons, like the Porsche Panamera S Hybrid emitting less CO2-per-horsepower than the Prius.

Horsepower-per-liter is often a measure of a vehicles performance efficiency. Many automakers clamor to make the magic 100 horsepower-per-liter. The Porsche Panamera S Hybrid, with its 333 horsepower supercharged 3.0 liter engine combined with the  47 horsepower electric motor actually makes a very impressive 125 horsepower per liter. And it still manages to get around 34.5 mpg. Can’t complain about that.

In terms of actual emissions, the Panamera puts out 159 grams of CO2 per kilometer whereas the Prius puts out about 89 grams of CO2 per kilometer. For comparision, the Chevy Volt puts out around 130 grams of CO2 per kilometer. Meanwhile, a Ferrari 599 GTB Fiorana 415 grams per kilometer from its 6.0 liter V12 engine. Getting a better picture? So the Prius is without a doubt the cleaner car.

Members the the Autocar Forum, however, are measuring the performance of its Panamera Hybrid on another scale; grams of CO2-per-horsepower. It is an interesting measure of performance and green cred, and if you do the math (380 hp/159 g/CO2) the Panamera makes 2.4 horsepower per gram of CO2 per kilometer. The Prius’s 1.8 liter 98 horsepower engine coupled with its 36 horsepower electric motor makes for a total of 134 horsepower, or 1.5 horsepower per gram of CO2. Interesting.

It’s a neat way to poke at the Prius and in fairness, it is a sign of the efficiency of the engine if you can make more horsepower with fewer emissions.  Then again, CO2 is just one measure of engine emissions, and I doubt anybody is going to trade in their Prius for a Panamera Hybrid after reading this. But as a different measure of engine efficiency, I thought this was neat. I always liked comparing horsepower numbers of muscle cars, so why not horsepower per CO2?

The Toyota Prius in a horsepower war with Porsche? Strange times indeed.

Source: Autocar Forums via AutoBlogGreen

Chris DeMorro is a writer and gearhead who loves all things automotive, from hybrids to HEMI’s. You can follow his slow descent into madness at Sublime Burnout.


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About the Author

Chris DeMorro is a writer and gearhead who loves all things automotive, from hybrids to HEMIs. When he isn't wrenching or writing, he's running, because he's one of those crazy people who gets enjoyment from running insane distances.



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  • http://Web Lee

    THAN!!!! it’s thAn!

    • http://chrisdemorro.com/ Christopher DeMorro

      @ Lee

      …it was a long morning, but when you’re right you’re right. Thanks for pointing that out.

  • http://Web Joao Soares

    First of all, I am sorry for my English . Your blog is great Chris DeMorro. In this topic I believe that it is not very correct to analyze CO2 per horsepower so directly as “they” are describing. The 89, 159 grams per CO2 per kilometre of Prius and Porsche (respectively) are given by a standard which follows the same profile versus speed/distance (on a laboratory as may you know). As the CO2 emission of a car is not linear and depends on the engine load and other factors it is necessary a different test. For that reason and to give a real value of CO2 per horsepower the cars should be running at maximum available power or in other words maximum speed. This should be done for both cars and then analyze/check the CO2 emission of each one during the same period of time. Obviously the Porsche value is greater in terms of absolute CO2 emission grams, however this value per horsepower could be less than Prius.. who knows..

  • http://Web phoenix1

    CO2 per horsepower–a weak attempt to disguise the inefficient use of horsepower. I like performance cars and sports driving, but misleading the general public abou the inefficiency of performance vehicles makes companies look devious. It’s more likely they are scared of regulators, but the average person assumes inpropriety.

  • http://Web C. Fitz.

    “the average person assumes inpropriety.”

    Or maybe the average person has a sense of humor, and realizes that this is tongue-in-cheek and not meant to be taken seriously.

  • http://Web SamIam

    Why ever would less CO2 emission be a goal at all? Totally pointless.

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  • http://Web Les

    The comparison should be horsepower generated and CO2 emitted at various speeds for each car. Citing maximum horsepower available is meaningless if it’s not actually being used.

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