Fuel Economy Data

This information is provided by the U.S. Environmental Protection Agency, Office of Mobile Sources, National Vehicle and Fuel Emissions Laboratory.

|Attribute|Description|
|-|
|Model|Vehicle make and model|
|Displ|Engine displacement - the size of an engine in liters|
|Cyl|The number of cylinders in a particular engine|
|Trans|Transmission Type and Number of Gears|
|Drive|Drive axle type (2WD = 2-wheel drive, 4WD = 4-wheel/all-wheel drive)|
|Fuel|Fuel Type|
|Cert Region |Certification Region Code| |Sales Area |Certification Region Code| |Stnd|Vehicle emissions standard code| |Stnd Description |Vehicle emissions standard description|
|Underhood ID |This is a 12-digit ID number that can be found on the underhood emission label of every vehicle. It's required by the EPA to designate its "test group" or "engine family." This is explained more here |
|Veh Class|EPA Vehicle Class|
|Air Pollution Score|Air pollution score (smog rating)|
|City MPG|Estimated city mpg (miles/gallon)|
|Hwy MPG|Estimated highway mpg (miles/gallon)|
|Cmb MPG|Estimated combined mpg (miles/gallon)|
|Greenhouse Gas Score|Greenhouse gas rating|
|SmartWay|Yes, No, or Elite|
|Comb CO2*|Combined city/highway CO2 tailpipe emissions in grams per mile|

* Not included in 2008 dataset
** Not included in 2018 dataset

Which of the following are relevant questions we could ask about this data?

Are SmartWay vehicles more expensive?

Are more models using alternative sources of fuel? By how much?

How much have vehicle classes improved in fuel economy?

What are the characteristics of SmartWay vehicles?

What features are associated with better fuel economy?

For all of the models that were produced in 2008 that are still being produced in 2018, how much has the mpg improved and which vehicle improved the most?

SOLUTION:

• Are more models using alternative sources of fuel? By how much?
• How much have vehicle classes improved in fuel economy?
• What are the characteristics of SmartWay vehicles?
• What features are associated with better fuel economy?
• For all of the models that were produced in 2008 that are still being produced in 2018, how much has the mpg improved and which vehicle improved the most?