Reference: R.M. Heavenrich, J.D. Murrell, and K.H. Hellman, Light Duty Automotive Technology and Fuel Economy Trends Through 1991, U.S. Environmental Protection Agency, 1991 (EPA/AA/CTAB/91-02).

Description: Based on data provided by the U.S. Environmental Protection Agency 
Number of cases: 82 
Variable Names: 
VOL: Cubic feet of cab space 
HP: Engine horspower 
MPG: Average miles per gallon 
SP: Top speed (mph) 
WT: Vehicle weight (100 lb)