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First it's 1,400 gallons

Second, about 6-7% (Extremely rough estimate)

Calculation:

Boeing 777 data: (nmi = Nautical Miles)

    Model      Fuel           Range      nmi/g
    777-200    31,000 US gal  5,240 nmi  0.17
    777-200ER  45,220 US gal  7,725 nmi  0.17
    777-200LR  47,890 US gal  9,380 nmi  0.20
(1,400 gallons * nmi/g)

Which means 238 to 280 nautical miles on a flight that is 3,772 nautical miles long. Which is a difference of 6-7%

Data from

- http://en.wikipedia.org/wiki/Boeing_777

- http://www.travelmath.com/flight-distance/from/Chicago,+IL/t...




Thank you for fixing both Wired's article and my units!

I still wonder about the variation due to weather though. I can say that flight times vary by at least 7%, so that would suggest that fuel use variation should also be over 7%.


> I can say that flight times vary by at least 7%, so that would suggest that fuel use variation should also be over 7%.

Couple of things to remember.

1. This was a single test flight. Not statistically significant by any measure.

2. My calculation was back of the envelope with unreliable figures. :)




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