Re: Fuel efficiency versus speed

[brian whatcott <inet@INTELLISYS.NET>]

There should be a proviso in there that the speed to engage top or
overdrive is likely to provide best mpg.
 I seem to recall figures between 25 and 40 mph for cars.

Brian

At 09:24 10/6/00 -0700, Shapiro, Mark wrote:
> Dear Laurent,
>
>        I don't know of any current data for trucks.  However, since air
> resistance goes roughly as the square of the speed, and on the open highway
> most of the net horsepower (after thermal losses) goes to balance the force
> of air resistance there isn't any way that you win on mpg by going faster.
>
> Mark Shapiro
> http://www.IrascibleProfessor.com
>
>
> -----Original Message-----
> From: Laurent Hodges [mailto:lhodges@IASTATE.EDU]
> Sent: Friday, October 06, 2000 9:13 AM
> To: PHYS-L@lists.nau.edu
> Subject: Fuel efficiency versus speed
>
>
> > Does anyone know a good source for fuel efficiency versus speed data for
> various types of vehicles, in
> > either tabular or graphical form?
>
> I haven't seen this on the internet, or anywhere in recent years. /snip/
> Laurent Hodges, Professor of Physics
> 12 Physics Hall, Iowa State University, Ames, IA  50011-3160
> lhodges@iastate.edu   http://www.public.iastate.edu/~lhodges
brian whatcott <inet@intellisys.net>  Altus OK
                Eureka!