Ranchie, I think when they went to the aluminum engines and unleaded fuel with catalytic converters, the engines got to the point that the food was getting burned too quick. To make cooking that way worth while.
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Back before fuel injection and catalytic converters, you used to be able to get cookbooks. They would tell you how many miles you had to drive to cook just about anything. Things like pot roast, with them mounted to your exhaust manifolds. Talk to some of the old time truck drivers...