These are not so much power adders as they are a means to control the thermal stress on an over fueled engine. True, there is a BTU benefit from the use of methanol, but the main benefit is from its tremendous latent heat. Water, of course, adds no power at all, it just keeps the pistons from melting. If you're not going to add significant power, I don't see any benefit to it, especially with the cost of methanol combined with its propensity to corrode certain metals and to absorb water.

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'83 300D, 126K miles.