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Old 03-29-2014, 11:12 AM   #1
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fuel economy & speed-interesting article

Read an article from Click & Clack that was interesting. They shared the link to this article.

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Old 03-29-2014, 11:33 AM   #2
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From someone in the automotive world, this is an excellent article!

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Old 03-29-2014, 11:34 AM   #3
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Good read.
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Old 03-29-2014, 11:35 AM   #4
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Hmmm...interesting article - looks like it is aimed towards semi drivers, but I suspect the basic math will transfer to RV drivers/draggers

So the bottom line is this from the article:
Increasing speed from 55 to 75 mph can increase fuel consumption by 39 percent, while cutting the effectiveness of fuel-efficient tires by 27 percent.

I'm not so sure I would want to pull my 5er at 75 anyway (65...yeah I do occasionally)
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Old 03-29-2014, 12:13 PM   #5
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I need to have a talk to my Duramax...the heavier the load I ask it to tow...the faster it wants to roll down the's almost toying with me to make it break a sweat! ,)

Good article
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Old 03-30-2014, 08:37 AM   #6
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Good article thanks for sharing
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Old 03-30-2014, 08:50 AM   #7
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I always found I got the best fuel mileage at 90 to 100 kph.
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Old 03-30-2014, 09:01 AM   #8
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Never new this but did find that driving 55 mph I gained a couple of miles per gallon, waiting to see how my new v lite does on the interstate at 65 mph.
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Old 03-30-2014, 10:48 AM   #9
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According to my logs (old habits die hard) my fuel economy is about %15 better at 65 than 72 in my daily driver sedan. Since we never break 65 with the camper attached to the truck I can't say on the 72-65 difference, but the difference between 55 and 65 is almost %15. Now, if we could just get rid of the crap they water the gas down with I'd get my %11 back from that too!

I also found the engine life/wear and tear factor, as well as that of the tires, an added incentive to slow it down a bit.

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Old 03-30-2014, 11:05 AM   #10
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Air resistance is not a linear resistance. It works on the square of the speed. Double the speed; you get 4 times the air resistance. It takes 4 times as much energy to combat air resistance at 60 mph versus 30 mph. So, their graphs all make sense. It is easy to see how air resistance becomes the dominant factor as speed increases.

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