("Montblack" wrote)
["Newps" wrote]
I get 199 MPH TAS at 23/2500(75%) on 15 gph or 191 MPH TAS at
22/2300(65%) on 13 GPH.


199 - 191 .......... = 8 mph
15 - 13 .............. = 2 gallons
2 gal x 3.99 ...... = $8

65% to 75%..... = $1 per 1 mph :-)


So now I did some more thinking...

2 hour flight - approx 400 miles
(not counting taxi, take-off, decent, pattern, land)

199 mph vs 191 mph = 16 mile difference at the end of the flight
16 miles takes 6 minutes at 160 mph ...1/10 hour (16x10)
16 miles takes 5 minutes at '192' mph ..1/12 hour (16x12)
[I changed 191mph to 192mph for smoother math]

We know from above post that it will cost 16 extra dollars for the faster
speed (based on 3.99 gallon fuel)

$16 to save five minutes.

But the fast plane is down 5 minutes sooner.
At $60 /hr fixed costs ...that's $1 /minute
....a savings of $5.

So to get there 5 minutes sooner on a 2 hour (400 mile) flight:
$16 fuel - $5 (tach time) savings = $11

$10 = $2/minute for arriving 5 minutes earlier on the ramp, 400 mile away.
Wow.

I'm seeing a "free lunch" if you choose the slower speed. :-)


Montblack
Ultimately it was a food based problem