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It's amazing how much that's old becomes new again. I had a 69 VW Beetle that had a "fuel warmer" by OEM design. Actually, what it was was a pipe from the exhaust manifold that passed underneath the carburettor. It seems these engines had a tendency to ice up the carb from the Joule-Thompson effect (I just had to throw that in, I've been dying to use it in conversation.), so somewhere in the late 60s VW started warming the carbs to prevent the icing. Apparently, this also had the effect of reducing the efficiency somewhat. Whether it was a wives tale or not, several of my VWs had this pipe cut out and brassed or welded up to apparently try to eek the mileage or power back up. My 69 modded in such a way would freeze up while idling if the dew point was low.
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