In article ,
Spehro Pefhany wrote:
[....]
Using mpg fuel consumption:

miles per hour = ((income in $/hr) * mpg)/($ per gallon)


Since the fuel use rises as the square of speed, in the range we are
talking about, we can use the MPG at 60 and write:

Y = (I * MPG60)/((Y/60)^2 * P)

if I did my math right:

Y = cubert( I * 3600 * M / P)

whe

Y = speed in MPH
I = income in $/hr
M = MPG at 60
P = price in $/gal

Tryin with some easy values:

Y = cubert(100 * 3600 * 30 / 3) = cubert(3.6E3) =150+a little


"You mean this is highway 80 and the speed limit is 65! Well in that
case, I'm gald you didn't catch me on the 205 last night."

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forging knowledge