That's the overdrive button. It is like 5th gear. If your car gets sluggish uphill, push it to the off position and the car will downshift into 4th gear with more power.
Then when your cruising on the highway, push it 'till it's on and it will pop into 5th gear and make the car drive faster and smoother. I also use mine as a downshifter to pass people as it gives a boost of extra power when taken out of 5th gear to zoom around the other cars. Try it on some freeway sometime. It is fun, kinda like a racecar shift! enjoy!
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