Don't understand why people are torqued about the MPG. - Page 3 - Smart Car Forums
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post #21 of 37 (permalink) Old 01-30-2008, 03:46 PM
 
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Originally Posted by jediknight36 View Post
Just wait. All of us that have been waiting and get this one, and they will come out with the 50mpg one next year. And the market will be flooded. Apple does that all the time. Here is a great product! (6mo later) no! You bought the wrong one, get this one!
It would be nice if they offered the hybrid that was shown at the auto show. I believe it cuts the engine when down to 5 mph and braking as well as having a generator to restart the vehicle when foot is lifted from the brake. I'm a 1411 and would love to opt for this version. The mpg were in the 50s I think.
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post #22 of 37 (permalink) Old 01-30-2008, 05:47 PM
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Originally Posted by Smarteq View Post
...that shortness means that the car is very tall and not very aerodynamic. I think that the Cd figures for this car are significantly higher than other cars we are comparing it to for mileage...
Just for grins, here is a comparison of Cd x frontal area for a couple of cars:

Car .................... Cd ........ Area (sq ft) ..... Cd x Area
Toyota Prius ....... 0.26 ........... 27.7 ........... 7.20
Toyota Aygo ....... 0.30 ........... 25.5 ........... 7.65 (+6%)
smart fortwo ....... 0.35 ........... 25.8 ........... 9.03 (+25%)

So cruising down the highway at 70mph, the smart is at a significant disadvantage.
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post #23 of 37 (permalink) Old 01-30-2008, 06:55 PM
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Quote:
Originally Posted by MicroNut View Post
Just for grins, here is a comparison of Cd x frontal area for a couple of cars:

Car .................... Cd ........ Area (sq ft) ..... Cd x Area
Toyota Prius ....... 0.26 ........... 27.7 ........... 7.20
Toyota Aygo ....... 0.30 ........... 25.5 ........... 7.65 (+6%)
smart fortwo ....... 0.35 ........... 25.8 ........... 9.03 (+25%)

So cruising down the highway at 70mph, the smart is at a significant disadvantage.
Stupid young guy question, but what is CD?
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post #24 of 37 (permalink) Old 01-30-2008, 07:08 PM
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CD = coefficient of drag. Cd X Area gives a relative measure of the power required to keep a car moving at constant speed. Higher CD X Area translates into worse gas mileage at high speed. At low in-city speeds CD is not an important factor in gas mileage.
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post #25 of 37 (permalink) Old 01-30-2008, 07:11 PM
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Oh well, thats is easy to see then. Thanks.
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post #26 of 37 (permalink) Old 01-30-2008, 07:48 PM
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The resistive force on a car due to wind resistance (aka "drag") is proportional to its drag coefficient times its frontal area times the square of its speed.

So for any vehicle, its drag at 60 mph is going to be four times its drag at 30 mph. That's why reducing a car's drag coefficient (i.e. making its shape more "slippery") makes a big difference to highway mileage, but has little effect around town.

For what it's worth, the power required to overcome any resistive force is proportional to force times speed. So the power to overcome drag at 60 mph is eight times that needed at 30 mph.
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post #27 of 37 (permalink) Old 01-31-2008, 03:10 AM
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How about the Cd of these SUVs LOL
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post #28 of 37 (permalink) Old 01-31-2008, 03:37 AM
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Wind resistance isn't the only thing that increases exponentially with speed; so does tire rolling resistance and engine and driveline friction. They all add up.
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post #29 of 37 (permalink) Old 01-31-2008, 04:07 AM
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Is no one remembering gravity?
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post #30 of 37 (permalink) Old 01-31-2008, 04:43 AM
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Someone had to say this...

Quote:
So cruising down the highway at 70mph, the smart is at a significant disadvantage.
What a drag!


or how 'bout......

this thread is dragging on

or


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