Sibyl Siwik: Your numbers are off a little.A321 runs like 8000 gallons to cross the US.Jet A is 0.8075 density, or about 6.74 lb/gal.Result is about 56 seat-miles per gallon. Its probably about 15% higher than this at an efficient cruise speed.Typical small piston powered aircraft do about 1/2 this on Avgas. Bizjets are far worse than this.Here's a link to give some rough comparisons. Using the stated range vs. fuel capacity is very approximate method; much fuel is used on the ground, during climb, etc. Also, there are reserve requirements that are not generally used in travel. Wind also makes a difference. Aircraft manuals have fuel consumption charts based on weight, temp, altitude, and speed. Compiling actual fuel consumption numbers is difficult task. Many manuals are available on line if you look enough; be aware that you need to estimate weights and know the number passenger seats - most have numerous configurations.Another possible approach is to collect airliner ! reported seat-miles and compare to fuel burned. While this averages across the fleet, the numbers between difference aircraft are likely pretty close, with modern and larger equipment having an advantage....Show more
Lon Pennington: check the FAA Circulars : here is a linkhttp://www.dot.ca.gov/hq/planning/aeronaut/htmlfil...one of those advisory circulars has an approx. estimation for fuel consumption BTW for every model u gotta check the aircraft manul , & not all of them are free online...Show more
Adrian Paraz: well if its 150 mpg then it would be 150/8 miles per lb. since its 8 lbs per gallon
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