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Very interesting, Mikeg. You'd think I'd remember a big garage building opposite [[Murphy's) Town House, down the street from the Royal Tavern, but I don't. Took a Google walk down Manitou Avenue...

GAzhekwe.....
.......Yup. This is all from memory, but I believe GM generally did cold weather testing based out of Pellston, and Chrysler usually did winter testing on Ontario Rte. 17, using Sault...

Thank you for posting that article, Packman. It was informative.

The only quibble I might have was that GM's high altitude test garage was on Canon Avenue in Manitou Springs, CO. Memory says it...

I know GM, Ford and Chrysler all have proving grounds in southeastern Michigan, as did Packard. Studebaker's was [[of course) in South Bend and the Nash/AMC facility was in Burlington, Wis, outside...