[Info-vax] Off-topic follow-up, now with actual data - mileage vs. speed

[spamsink2001@yahoo.com]

On Saturday, December 21, 2013 3:24:58 PM UTC-5, JF Mezei wrote:
> >> A while back, I think twice even, discussion of gas mileage came up for some 
> 
> >> reason. Many here claimed higher speeds get better mileage.
> 
> 
> 
> Depends on the engine. Fossil fuel engines are tuned to be most
> 
> efficient at a certain RPM.   This is one reason hybrid cars are more
> 
> fuel efficient: the generator runs at the fuel engine's most efficient
> 
> speed no matter what the car is doing.
> 
> 
> 
> Similarly, jet engines now have different speeds for the big fan and the
> 
> actual turbine sections so that the turbine can run at the most
> 
> efficient speed. A long range aircraft is tuned so that most efficient
> 
> fuel efficiency is at cruise speed. Shorter range engines are tuned
> 
> differently because the aircraft spends much time at different speeds
> 
> (take off, climb, short cruise, and descent).

The third reference is a Consumer Reports article. From the article:

"The Honda Insight hybrid showed the largest drop in fuel economy — over 15 mpg going from 55 to 75 mph."

AEF  a.k.a. spamsink2001 at yahoo.com