The problem that crazy old man was referring to occurs if the seals are dried out. If the top has never been taken off, the seals "may" be compressed as flat as they can be then again they may still be in fine shape, you will know that after you take it off the first time. It is possible that they will not survive but that is easily fixed with new seals.
Take your top off and enjoy it.
As far as gas milage, it wasn't in the design plan. However, there are things that can be done to improve it and gain power at the same time. Yes 82BRONCO, you can have your cake and eat it too

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Good luck from another crazy old man

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