of ce transportation epa420 r 06 011 and air quality july 2006 light duty automotive technology fuel economy trends 1975 through robert m heavenrich advanced division us environmental protection agency notice this technical report does not necessarily represent nal epa decisions or positions it is intended to present analysis issues using data that are currently available the purpose in release such reports facilitate an exchange information inform public developments table contents page number i executive summary ii introduction 1 iii general car truck 6 iv by vehicle type size weight 18 v 36 vi marketing groups 67 vii characteristics fleets comprised existing efficient vehicles 77 viii references 87 appendixes a q cont appendix database details calculation methods b model year nameplate listings c distribution d stratified e
