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.
The cost of fuel is the number one largest cost associated with driving a tractor trailer. On average, a standard passenger vehicle uses 500 gallons of unleaded fuel per year. A tractor trailer uses up to 20,500 gallons of diesel fuel in the same time period.