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How much extra overhead is there with a cisco VPN tunnel? Do I lose bandwidth capacity

If I setup a VPN tunnel with a 100 Mbps ISP connection on both ends.  Is it safe to say my VPN tunnel link has a bandwidth capacity of 100 Mbps?  What are the pros and cons of using a VPN tunnel vs. using a MPLS link of smaller bandwidth capacity?

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Hi,

HOW many is the MTU on the ISP, what type of VPN do you use?
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FREDARCE

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We are most likely going to have Cisco ASA's on both ends.  The mtu on all interfaces are set to 1500
We are looking to use AES-256 bit encryption.