This dataset contains a subset of the fuel economy data that the EPA makes available on 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.
mpg
A data frame with 234 rows and 11 variables:
manufacturer name
model name
engine displacement, in litres
year of manufacture
number of cylinders
type of transmission
the type of drive train, where f = front-wheel drive, r = rear wheel drive, 4 = 4wd
city miles per gallon
highway miles per gallon
fuel type
"type" of car