\name{Fuel economy}
\docType{data}
\alias{mpg}
\title{Fuel economy data from 1999 and 2008 for 38 popular models of car}
\description{

This dataset contains a subset of the fuel economy data that the EPA makes available on \url{http://fueleconomy.gov}.  It contains only models which had a new release every year between 1999 and 2008 - this was used as a proxy for the popularity of the car.

\itemize{
  \item manufacturer.
  \item model.
  \item displ. engine displacement, in litres
  \item year. 
  \item cyl. number of cylinders
  \item trans. type of transmission
  \item drv. f = front-wheel drive, r = rear wheel drive, 4 = 4wd
  \item cty. city miles per gallon
  \item hwy. highway miles per gallon
  \item fl.
  \item class.
}

}
\usage{data(mpg)}
\format{A data frame with 234 rows and 11 variables}
\keyword{datasets}
