During the long promotional buildup to introduction of its "displacement on demand" (DOD)-equipped pushrod engines, General Motors Corp. has characterized the overall fuel economy gain to be in the 6% to 8% range. But some real-world driving situations may yield much better rewards, a GM source confirms. At steady highway speeds on relatively flat terrain, the fuel economy gain can be as much as 20% to 25%, says one GM Powertrain source. GM will deploy DOD technology on some ...
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