This thread may already be beaten to death (I'm on digest and haven't check back for awhile) but....

Re: running on tap water--

Have you people never heard of water injection? The theory being that the atomized water cools, and therefore densifies (scientific jargon) the mixture. More dense equals more pop per piston. Simple. Big news a long time ago for muscle cars running high compression on relatively low octane gas.
bw