Fuel Efficiency

| Case Study: Fuel Efficiency |

Fuel Efficiency

The analysis was taken to understand the relationship between Weight, MSRP (Manufacturer’s Retail Price in $), and Engine Size with Fuel Efficiency both in the City and on the Highway for the cars.

The data shows that more expensive cars have more powerful engines, that generally weight more, and they are more fuel consuming both in the city and on the motorway comparing with the small, less expensive cars with less powerful engines. The small car with a small engine is more fuel efficient.

This association increases with the type of the car – for big cars like Minivan, Wagon and SUV the correlation between Weigh and Consumption in the City and on the Highway is even stronger than the correlation for Sedan cars. If for the Sedan cars the correlation is negative and moderate, for the big cars the correlation is negative and very strong. It shows that the bigger the car is, less miles per gallon it can make.

There is an outlier – a car that does not fit the overall pattern– Prius, its fuel consumption is abnormally low ( 60 mpg in the city against 32 mpg –min value and 51 mpg on the highway against min 40mpg). Prius is a new generation, environmentally friendly - hybrid car, and therefore should not be considered in our analysis and be compared with other gas cars.

If not taking into consideration Prius, the most fuel efficient car is Corolla_LE with the minimal consumption in the city of 32 mpg and 40 mpg on the highway. Its weight is close to the min = 2,524 pounds (min weight is 2,469 pounds).

The most fuel non-efficient car is H2_Lux with the maximum consumption in the city of 11 mpg and 11 mpg on the highway. It also has a maximum weight = 6,400 pounds and it is in the upper category of the price.

The bigger is the Engine size more cylinders it has (strong positive correlation). The cars with high retailers’ price have more powerful engines with more cylinders. The bigger engine it has, the bigger is...