Eclipse's top cruise speed is an impressive 370 knots at 33, 000 feet, burning 90 gallons per hour.

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Because these big tractors they use a lot of fuel, you know, anywhere from five to 12 gallons per hour.

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Once at cruising altitude I dialed in an economy fuel setting of 53 gallons per hour at a true airspeed of 390mph.

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Fuel burn at that setting is a stingy 55 gallons per hour.

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This means I can fly 170 nautical miles per hour on 14 gallons per hour instead of going a slightly faster 180nmph on 18gph.

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That's about 66 gallons per hour of flight.

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Normal cooling systems don't require the massive amounts of water -- around 7 metric tons (1, 850 gallons) per hour -- now being poured into the reactors.

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Under any conditions, 340 knots on 53 gallons of fuel per hour is an impressive performance.

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By limiting the speed limit of its trucks to a maximum 60 miles per hour, the company estimates that it can save 3.75 million gallons of diesel fuel and cut carbon dioxide waste by 83 million pounds per year.

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