Why mechanical efficiency of diesel engine is greater than petrol engine?

Do you fix a transmission leak? Ok you have a 2002 Mazda Protege and the blinker and dash lights stay on what is going on? Why does your engine build up pressure and leak antifreeze out the overflow? What is a chime module? What fram oil filter do you need for a gmc envoy 4.2 liter? Are Replacement parts available that help hold the support rods on the Park Ridge 3 Seat Swing Awinging? What size tires does the suzuki 250 quad runner have? The correct location for the pads when hoisting or jacking the vehicle can often be found in the? Where is the fuel filter on your 1966 Plymouth fury with a 318 engine? When you stop at a stop light or your car is in park it idles rough kind of a pulsating idle instead of smooth and you smell antifreeze when you get out the car but no engine light is on What is Wrong? What part of the tire adds strength and stability to the tread? How would you describe the line below? What tool do you use to take off oil filter? Best transmission fluid 1991 Honda Civic? If the check engine light is on but everything seems normal on a 2003 ford focus? What size windshield wiper blades for Trailblazer? Is a 195 65r 15 tire interchangable with a 195 60r tire? Did the 2001 Saturn L300 come with a timing belt or a timing chain? What are the various parts needed for an ice machine? How do you find the axle ratio of a 2001 silverado?