# Fuel Economy: Speed Matters

Hard
Are you ready to find out how much gas you can save by slowing down? In this science project, five cars are tested to see how much fuel they use when driven at different speeds.

## Hypothesis

The hypothesis is that driving at 90 km/h (about 55 mph) produces better fuel economy than driving at 11 km/h (about 70 mph).

## Method & Materials

You will need five drivers and five types of cars, and 250 liters of gasoline (about 65 gallons). The drivers will drive the cars at a constant speed of 90 km/h and 110 km/h, and record the distance traveled on 20 liters (or 5 gallons) of gasoline.
You will need five drivers, five types of cars, and 250 liters of gasoline (about 65 gallons).

## Results

The results of the experiment showed that all of the cars were able to travel for longer distances (of about 20% to 30%) when driven at 90 km/h compared to when the cars travelled at speeds of 110km/h.

## Why do this project?

This science project is interesting because it shows how much fuel can be saved by driving at a slower speed. It also shows how different cars can have different fuel efficiencies.

## Also Consider

Variations: Repeat the science project, this time, using vehicles with higher engine capacities. The science project experiment can be repeated using different grades of gasoline.

## Full project details

You can find additional information and details for this science fair project here. Have fun exploring!