DETROIT is finally getting the message. General Motors announced this week that it will close four truck plants and seek a buyer for its Hummer division. American carmakers are at last moving from gas-guzzling sport-utility vehicles (SUVs) and pick-up trucks toward fuel-sipping family cars. Ironically, this abrupt reversal—forced on GM by a looming recession and petrol at $4 per gallon—threatens some of the industry’s best fuel-saving technology. GM’s “two-mode” hybrid drive,...

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