Vehicle info from the EPA for 2021

Details from the EPA.

Usage

epa2021

Format

A data frame with 1108 observations on the following 28 variables.

model_yr: a numeric vector
mfr_name: Manufacturer name.
division: Vehicle division.
carline: Vehicle line.
mfr_code: Manufacturer code.
model_type_index: Model type index.
engine_displacement: Engine displacement.
no_cylinders: Number of cylinders.
transmission_speed: Transmission speed.
city_mpg: City mileage.
hwy_mpg: Highway mileage.
comb_mpg: Combined mileage.
guzzler: Whether the car is considered a "guzzler" or not, a factor with levels N and Y.
air_aspir_method: Air aspiration method.
air_aspir_method_desc: Air aspiration method description.
transmission: Transmission type.
transmission_desc: Transmission type description.
no_gears: Number of gears.
trans_lockup: Whether transmission locks up, a factor with levels N and Y.
trans_creeper_gear: A factor with level N only.
drive_sys: Drive system, a factor with levels.
drive_desc: Drive system description.
fuel_usage: Fuel usage, a factor with levels.
fuel_usage_desc: Fuel usage description.
class: Class of car.
car_truck: Car or truck, a factor with levels car, 1, ??, 1.
release_date: Date of vehicle release.
fuel_cell: Whether the car has a fuel cell or not, a factor with levels N, NA.

Source

Fuel Economy Data from fueleconomy.gov. Retrieved 6 May, 2021.

Examples


library(ggplot2)
library(dplyr)

# Variable descriptions
distinct(epa2021, air_aspir_method_desc, air_aspir_method)
#> # A tibble: 5 × 2
#>   air_aspir_method_desc     air_aspir_method
#>   <fct>                     <fct>           
#> 1 Turbocharged              TC              
#> 2 Naturally Aspirated       NA              
#> 3 Supercharged              SC              
#> 4 Other                     OT              
#> 5 Turbocharged+Supercharged TS              
distinct(epa2021, transmission_desc, transmission)
#> # A tibble: 7 × 2
#>   transmission_desc                                                 transmission
#>   <fct>                                                             <fct>       
#> 1 Automated Manual- Selectable (e.g. Automated Manual with paddles) AMS         
#> 2 Manual                                                            M           
#> 3 Semi-Automatic                                                    SA          
#> 4 Automated Manual                                                  AM          
#> 5 Continuously Variable                                             CVT         
#> 6 Automatic                                                         A           
#> 7 Selectable Continuously Variable (e.g. CVT with paddles)          SCV         
distinct(epa2021, drive_desc, drive_sys)
#> # A tibble: 5 × 2
#>   drive_desc              drive_sys
#>   <fct>                   <fct>    
#> 1 All Wheel Drive         A        
#> 2 2-Wheel Drive, Rear     R        
#> 3 2-Wheel Drive, Front    F        
#> 4 4-Wheel Drive           4        
#> 5 Part-time 4-Wheel Drive P        
distinct(epa2021, fuel_usage_desc, fuel_usage)
#> # A tibble: 6 × 2
#>   fuel_usage_desc                            fuel_usage
#>   <fct>                                      <fct>     
#> 1 Gasoline (Premium Unleaded Required)       GPR       
#> 2 Gasoline (Premium Unleaded Recommended)    GP        
#> 3 Gasoline (Regular Unleaded Recommended)    G         
#> 4 Gasoline (Mid Grade Unleaded Recommended)  GM        
#> 5 Diesel, ultra low sulfur (15 ppm, maximum) DU        
#> 6 Diesel, low sulfur (500 ppm)               D         

# Guzzlers and their mileages
ggplot(epa2021, aes(x = city_mpg, y = hwy_mpg, color = guzzler)) +
  geom_point() +
  facet_wrap(~guzzler, ncol = 1)


# Compare to 2012
epa2021 |>
  bind_rows(epa2012) |>
  group_by(model_yr) |>
  summarise(
    mean_city = mean(city_mpg),
    mean_hwy  = mean(hwy_mpg)
  )
#> # A tibble: 2 × 3
#>   model_yr mean_city mean_hwy
#>      <dbl>     <dbl>    <dbl>
#> 1     2012      19.4     26.4
#> 2     2021      20.9     27.3

Usage

Format

Source

See also

Examples