One way to avoid the need for stringent fuel conservation measures is to use less fuel as a matter of course, and to that end the National Highway Traffic Safety Administration (NHTSA) has arranged its series of Innovators' Seminars, the sixth of which will be March 17.

At the seminar, announced in the Feb. 26 Federal Register (page 14251), three inventors will describe their tiny, 100-mile-a-gallon-or-more cars of the future.

James R. Bede, an engineer from Cleveland, will talk about his 1,104-pound, four passenger BD-100, which reportedly gets 117 miles a gallon at 48 miles an hour. Dr. Robert Fondiller, a New York investor, physiologist and management consultant, will describe his three-wheeled, 600-pound electric car, a gas-powered version of which he hopes will get 150 miles to the gallon. Finally, there will be a film of inventor David Bright's three-wheeled, enclosed motorcycle. w

NHTSA will open the public session with a discussion of sub-subcompact cars and the regulatory, safety and fuel economy issues that involve them, then the session will wind up with comments from officials of the Department of Energy, Office of Technology Assessment, Federal Highway Administration and Environmental Protection Agency.

The meeting will run from 10 a.m. to 1 p.m. in Room 4234, Department of Transportation Building, 400 7th St., SW, Washington, DC. For more information call Dr. Carl C. Clark, Inventor Contact, NHTSA, (202) 426-4875.