NBC Evening News for Monday, Mar 28, 1977
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(Studio) Since institution of 55 m.p.h. speed limit truckers have said they can't get good mileage going at that speed; report on truth in this follows.
REPORTER: David Brinkley
(Los Angeles, California) Tests have shown higher speeds aren't more economical or safe. Details with regard to safety tests and statistics noted. Various tests re: fuel economy for trucks, especially by Federal Highway Commission test in Virginia and by GM computer test, cited as evidence higher speeds not economical. Recent tests for EPA, on 18-wheel gas and diesel trucks by Southwest Research Institute, show most economy speed for heavy duty trucks is 30-40 m.p.h. It's realized longer delivery time costs more money and driver makes less, but for fuel economy and safety, 55 m.p.h. not to low, it's too high.
REPORTER: Frank Bourgholtzer