neilpilot
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I've run tanks dry intentionally in both the C and E models. With the sTec in altitude hold, no altitude lost, just a moderate speed reduction during tank switch. Sometimes fuel pressure or a bouncing level gauge was an imminent warning that the engine was about to quit, but not always. Note that the injected IO-360 in the E would quit immediately, while the O-360 in the C would continue to sputter and never quite stop during the tank switch. I suggest you retard the throttle before refiring, if possible, to prevent overspeed on restart.
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I use HEET, one bottle per side, if it goes below 20F and/or I'm concerned about residual moisture. Can be found in the PMN section of many auto parts stores. Be sure to use HEET in the red bottle, since the other formulation is methanol which is not good for the Mooney. I once met a pilot who would use rubbing alcohol. That is isopropanol in water and does not go well in the fuel system. BTW I make isopropanol at work, which we burn as a supplemental fuel in our steam boiler. Sometimes tempted to "borrow" some, but that's not worth the hassle.