it depends, pilots fly airplanes at different altitudes depending on the weather systems around the area at the time. Most large aircraft or jumbo jets want to fly at altitudes exceeding 25,000 feet because at higher altitudes jumbo jets burn less fuel to go the same distance that it would take if it were flying at a lower altitude. I would estimate that passenger planes fly somewhere between 30,000 feet and 40,000 feet. Jumbo jets can't fly much higher because the air will become so thin that they can't climb and more. And much lower will require more fuel because the air is more dense.
Generally yes. There is less drag at higher altitudes, and thus better fuel economy, right up until the airplane can't get enough air to burn with with fuel to get the power needed to go faster and higher. Of course it takes extra fuel to get up there, so only long distance travel is done at high altitudes.
More massive stars have much higher temperatures and pressures. Although they have a lot more fuel, it is consumed at a much higher rate than lower mass stars. They burn very brightly and hot, but for less time. Lower mass stars have lower temperatures, but they have longer lives as they burn their fuel at a much lower rate.
The fuel burn of any aircraft varies according to aircraft configuration, type and number of engines, weight, altitude, etc., but a "rough" average hourly burn for "jumbo jets" (Large, heavy, four engines) would probably be in the 20,000 + lbs per hour range. (3000-3500 gal/hr) By contrast, a fuel efficient 767 with only two engines can burn in the range of 10,000 pounds per hour or less. A typical 5+30 flight from Seattle to Hawaii in a 767 will use around 50,000 pounds of fuel. (Jet fuel, depending on temperature, is usually calculated at about 6.7 pounds per gallon.)
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