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wrote:
On Sat, 23 May 2015 19:24:23 -0400, Wayne.B
wrote:

On Sat, 23 May 2015 18:49:13 -0400, Keyser Söze
wrote:

Whatever is being measured, it isn't likely that car is delivering 46
mph at 90 mph. Period.
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Ignoring your drunken typo, let's do the math. If a car is getting
46 miles per gallon at 90 mph, that means it is burning 2 gallons per
hour. 2 gph with a gasoline engine implies about 20 horsepower (10 hp
for every 1 gph - good rule of thumb). It seems unlikely that even a
slinky car like a 'vette could do a sustained 90 mph with only 20
horsepower. More likely it was either a transient reading or some
sort of glitch in the instrumentation.

I had the instant MPG on my old LeBaron and it was fun to peg it at
99MPG ... coasting down the Sunshine Skyway bridge. It would be
interesting to see how long he could keep up that number at 90

99mpg is probably the highest it would read. Coasting would be much higher!