“Slow Down and Save Gas” says CNN

Here is an article on CNN that talks about how you can save gas by driving at optimum speed.

I have a similar post, but my argument was based on the gear train efficiency. This article talks about air resistance. As noted there, the resistance of air increases exponentially as the speed increases. So obviously if you are driving slower, the energy your car spends in overcoming air resistance will be significantly less. As your speed increases, this fraction increases rapidly.

This will also help explain why drafting behind a vehicle will result in fuel saving. Also this must be a factor that makes cars more fuel efficient compared to SUVs.

~ by Kedar on March 28, 2008.

25 Responses to ““Slow Down and Save Gas” says CNN”

  1. My friend and I were talking about this very thing last week! If you keep your car under 3K revs the gas consumption is significantly lower.

  2. Driving faster makes folks use their brakes harder when they need to slow or stop. Brakes convert the energy of motion into heat wasting it. Folks should drive as if they had no brakes to get in the habbit of using them as little as possible. The less you brake the less fuel you need to get moving again.

  3. You could also use Nitrogen in your tires insted of air the Benefits of High-Purity Nitrogen tire inflation has been used for many years by industry professionals. They used the gas primarily for increased safety, better pressure retention and increased pressure stability. While High-Purity Nitrogen inflation does not relieve the motorist from checking their tire pressure regularly, it will on average maintain a safe level of tire pressure for a much longer period of time. In addition, it will reduce tire aging, wheel oxidation and reduce pressure swings caused by moisture found in regular compressed air.


  4. Slowing down does NOT equal saving gas! Each gear has an ideal sweet spot where it gets it’s best gas mileage. And a gears ‘sweet spots’ changes depending on many factors such as drafting, climbing hills, road condition, surrounding evironment, etc… My ideal gas mileage speed on a flat straight road is right around 76mph (2750 rpms)! I’ve tested this over several hundred thousands of miles and it rings true every time.

    Note: Coming from the midwest, we have interstates with 75mph speed limits, so please don’t think that ‘driving this fast’ is bad and wreckless. Quite the contrary, it provides tremendous skills and awareness!

    You can check out all of my “247 Gas Saving Tips” at SaveGasNow.org… Affiliates earn 100% commissions. 🙂

  5. Hunter – I disagree…i’ve done lots of research on this and compiled it here: http://www.mpgforspeed.com/ You can calculate the exact difference each speed makes.

  6. This is just one of the areas we need to conserve. Many more over at http://www.energyefficientnation.org/

  7. Top 3 ways to save energy:

    3.Adjust the water level on your washing machine to match the load size, especially when using hot water. Always use a cold rinse.

    2.Avoid pre-rinsing dishes before putting in dishwasher. It can save up to $70 a year.

    1. USE http://www.GOOCOAL.COM AS YOUR DAILY SEARCH ENGINE. Your monitor saves energy when it is black. Press “CTRL + D” to save GOOCOAL.COM as your homepage.

  8. We all have to do our bit to save our planet, rather open a window on a hot day then reaching for the air con, turn down the thermostat on your geyser every little thing does help protect our planet.

  9. То что бредомысли это точно 🙂
    Видно настиг творческий кризис. Мысле нет о чем писать 🙂

  10. Отличная статья.Респект автору.

  11. Интересно даже для бухгалтера :)))))

  12. Информативно,продолжай в том же духе

  13. hohhoh reading all this just to save energy visit http://hydropowersaver.co.cc break through in technology

  14. Оригинальная идея. Интересно сколько времени он на это потратил

  15. Не получается скормить вашу ленту читалке Abilon. Точнее могу, но читать не получается – прога по ходу не может ничего получить. Добавляю эту ленту – https://savingenergy.wordpress.com/feed/. Помогите дебилу – кто чем читает savingenergy.wordpress.com?

  16. Даужж никогда не думал об этом …

  17. lovely post!! I have read some of your posts and is really impressed. I am adding your blog to my RSS Feed reader.

  18. I can really relate to this. As I have 6 points on my driving license, I have to drive very conservatively for a while, (as opposed to as fast as I could), and the fuel consumption during this period has gone down so much, it is amazing, and made me realize the enormous financial benefits at stake with more intelligent driving. And I still arrive only 5-10 minutes later than I normally would have done.

  19. Nice post.Right step towards conservation.

    Thanks for writing on energy conservation.Looking for more energy saving tipsfrom you.

  20. The chance to slow down in a car would be very welcome, but anyone driving on the M25 around London knows that the problem isn’t braking…it is accelerating!!

  21. I really like your posting and that’s really great thing, keep posting.

  22. This is definitely an awesome post and something to keep in mind. I’ll be sure to try this out for myself next time I’m on the road!

  23. We are serious about doing our part to save energy and protect the environment. Recently Sean McCutcheon’s Air Conditioning and Heating, Inc. worked on “The Power Haus” built by Josh Wynne Construction. Located in Sarasota, Florida, the house has achieved a minus 22 HERS index, the lowest HERS rating on record in the US, and is producing more energy than it consumes on a yearly basis.

    This home has a 14.2 uni-solar flex lite amorphous silica that produces energy. It was reported that even if Power Haus doesn’t use this solar energy and depends on purchased energy, its score on HERS index would not cross 42.


  24. I read online today that in order to maximize gas efficiency, you should drive at a constant speed of 55-60 mph.

  25. “I read online today that in order to maximize gas efficiency, you should drive at a constant speed of 55-60 mph.”

    Yes, but then you run into the issue of braking and how much energy that wastes. It would be difficult to limit braking when traveling at those speeds.

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