Whenever you visit a showroom to buy a car, the salesman will tell you a mileage that will be far higher than the actual mileage that any car would give you. When you go back to the showroom and ask him about the difference, naturally, like all of us would be familiar by now, they will just say that the car would give that mileage on average testing conditions.

So to understand fuel economy better, we need to know what the standard testing conditions are.

A car driven on a smooth, straight and level road at a constant speed, accelerating gradually, shifting gears at speeds and engine rpm as specified in the manual, never breaking and never exceeding 50 MPH at any time and not even fluctuating is supposed to be the standard testing conditions of any vehicle. To add more details to it, to reduce friction, all joints should be greased and lubricated well, the car shouldn’t weigh a lot, loaded with people and their luggage, tyre pressure should be optimum, and the air filter and the engine lubricant should all be clean and new.

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