Further Results from the 1978 Fuel Economy Survey
Further analyses of the 1978 in-use fuel economy survey are presented. Effects of usage on 1978 model year cars are determined. The in-use fuel economies are then adjusted to standardize for usage. The adjusted fuel economies have lower variability and yield better relationships with metro-highway fuel economy ratings.
IN-SERVICE FUEL ECONOMY
Ford Motor Company surveyed management personnel who drive Ford lease vehicles. From the responses, in-use fuel economy data were computed on over 10,600 1978 model year cars. Analyses of the data are presented which include: fuel economy summary statistics; regressions of fuel economy ratings versus in-use fuel economy; measures of the ability of EPA ratings to rank in-use fuel economy; and the influence of car size class or transmission type on fuel economy regression and correlation. Wide ranges of fuel economies were found for each vehicle model type. The analysis shows no significant trend by car size class in the relationship between in-use fuel economy and metro highway fuel economy ratings.
Mahler functions and transcendence
Transcendence theory of mahler functions of one variable.- Transcendence theory of mahler functions of several variables.- Algebraic independence of mahler functions and their values.- Applications of elimination theory.- Regular sequences and mahler functions.