New Car Sales for March 11‐20 Below Expectations
domestic new car sales for Mar 11-20 are lower than expected and only match '75 performance; annual selling rate for Mar 1-20 drops to 9.8-million level from high of 11-million for Mar 1-10; only Ford Motor posts sales increase; execs and analysts weigh adverse impact of GM's move toward standardized engines; other comments noted; sales breakdown by co; table (M)