As many of us prepare to venture out for our summer vacations there is an old habit often performed at the gas pump that we need to break.

It’s called topping off the tank.

FIND THE BEST GAS PRICES | Channel 3 Fuel Finder

It happens when the gas nozzle clicks to tell us our tank is full. Many drivers try to squeeze a few extra drops into the tank.

It could damage your car.

Why?

11Alive’s Why Guy spoke to automobile mechanics around metro Atlanta to learn the reasons why we should avoid topping off the tank.

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