You could tune it with just water and in the winter if you do drive it put a mix in. It won't hurt anything, just richen it up, how much will depend on how much meth you run. There are some guys making 500+ with just water.
I had actually planned on running a mix, then decided I didn't want to tune up for it because if it doesn't work or runs out it will probably lean it out so much it will blow the motor so as of now I'm tuned on just water. For example I was running 35meth/65h2o(blue washer fluid) and it was around 0.5-0.7 richer than just H2O, but it will all depend on how much you are injecting.
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