It varies, some Over-the Road trucks have a modest number of cylinders ( like 6) but large volume capacity- over the summer I saw a l5 or l6 Liter Diesel on a Kenworth rated at 475 HP ( idle rev- the...
The mail van used by the USPS nowadays is the http://wiki.answers.com/wiki/Grumman_LLV. This is a custom-made mail van manufactured by Grumman Corporation, whose USD 1.1 Billion dollar contract with...
2) A diesel engine is the best motor for any truck. trucks need torque to pull with and diesel make more torque then gasoline engines. If you used 2 trucks one gasoline powered one...