How much fuel does a learjet model 31 use per hour?

Answer 1

approximately 200 gallons the first hour and 180 gallons each of the 2nd and 3rd hours after which it needs to be on the ground soon. It can be throttled back to about 180 and 160 for a little more range / endurance of 3 and a half hours. Anything more is pushing it. Shorter trips flown with lighter fuel and passenger loads can see first hour burns lower than 200. The more ya carry, the more ya burn! Most of the fuel burned by the space shuttle is simply expended to lift other fuel. Such is the nature of high-altitude flight.