It's an interesting fact that many of today's large, high-powered engines often get better gas mileage than yesterday's smaller, lower-powered engines. For example, a typical 40 HP, four-cylinder engine installed in a rumble-seat roadster from the early 1930's might travel eighteen to twenty miles on a gallon, whereas a modern 180 HP V6 installed in a mid-size sedan of the mid 1980's might go as far as thirty miles on that same gallon - and emit a whole lot less in the way of toxic exhaust. A lot of this is due to today's high-tech fuel-delivery and exhaust system that makes sure every precious drop of fuel is used and burned as cleanly and efficiently as possible.

The Mercury Grand Marquis Oxygen Sensor is a fine example of how the modern exhaust and fuel systems work hand-in-glove to see that your vehicle gets the most out of every drop of gasoline. Located right ahead of the muffler, the Mercury Grand Marquis Oxygen Sensor analyzes the gases exiting from the catalytic converter for the amount of oxygen present in the exhaust.

The oxygen sensor sends data based on this information to the fuel injectors, which then adjust the fuel-air mixture for current driving conditions. This insures that your engine makes the best use of its fuel, maximizing power while minimizing fuel consumption and exhaust emissions.

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