As of 2012, NACE reported that mechanical engineers with a master's degree started at an average of $75,700 -- significantly more than the average starting salary of $61,300 reported by mechanical engineers with a bachelor's degree.
How many gallons does a semi truck hold? Quick Answer. Semi truck fuel tanks vary in size, but they hold an average of 125 to 300 gallons of fuel. There is a fuel tank located on each side of the tractor, and fuel is distributed between the two tanks to balance weight.
One barrel of oil weighs about 0.136 metric tons, so thatâs about 707 barrels of crude in each car. A barrel of crude is about 42 gallons, so thatâs 29,696 gallons per car. These numbers are reasonably close, which is a good sanity check. Airplane fuel efficiency varies greatly depending on how full the plane is, the weather, and other factors, but we used a rough estimates of five miles per gallon.