Powered ultralight engines vary depending on their application, the most efficient engines burn less than 1 gallon per hour.
Pilots use gallons per hour instead of miles per gallon when dealing with the fuel burn rate of aircraft engines. One good example for the reason for this, would be a helicopter hovering, it can hover over the same spot for hours and never move a mile. The engine of the helicopter is still burning fuel.
The Federal Aviation Administration has placed several restrictions on ultralights. One of those restrictions is that it must have a fuel capacity that does not exceed 5 gallons of fuel. This restriction limits the size of the engines used on powered ultralights and their range.
The worlds lightest airplane is I believe the ultralight. Now ultralight aircrafts come in many different shapes and sizes but they are the "Family" of the lightest planes. To see what they look like, go to google.com and type in pictures of ultralight planes.
20 miles to the gallon 20 miles to the gallon
15 miles to the gallon 15 miles to the gallon
it can get 8 miles to the gallon
18.5 miles a gallon
16.5 miles per gallon
52.27 miles per gallon
About 21.4 miles per gallon. (300/14 = 21.4)
Between 13 miles per gallon and 16 miles per gallon.
it will do around 24 miles to the gallon
5.8 miles per gallon
9-13 miles per gallon