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My guess is no. However it could be dangerous as gas could spill out on turns and possibly combust if it were sparked or came in contact with a hot exhaust pipe. Yes. The fuel system is operating in a positive pressure dynamic. Not having your gas cap secured, does not allow the fuel pump to fully pressurize the system, thusly NOT ALLOWING THE SYSTEM TO WORK AT DESIGNED EFFECIENCY.

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โˆ™ 2006-03-17 21:35:35
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Q: Does driving without a gas cap effect fuel economy?
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