General Motors Corp. steps out of the pan and into the fryer with the announcement it will close the Mesa, AZ, desert proving ground and move to Mezcala, Mexico. Mesa, GM says, simply isn't hot enough. “We need average day-time weather temperatures that are in the 90s and Arizona isn't that hot from October to April,” says Ian McEwan, GM executive director of proving grounds and test operations. The temperatures in Mesa dip into the 60s during winter. Mezcala, on the other hand, meets ...

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