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It would depend on your TDC clearance with the OEM gasket, and what percentage smaller the thinner gasket would achieve. (Check your stock valve clearance) More could be achieved by milling the deck, but, again, be careful not to mill so much that you begin slapping your open valves. Alternatively, you could fill in the combustion chamber in your heads without causing valve -piston interference. Find your Combustion Chamber Volume, and work from there - it shouldn't take much fill. Avoid sharp edges that might lead to pre-ignition. But Hayden is right, Higher compression will get you higher HP, but the fuel required will more than wipe out any financial advantage of higher MPG.
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