Approximately 5-15% of the fuel consumed by a typical car may be used to overcome rolling resistance.

We know the weight, but where does the rolling resistance come from?

Some of the advice is the same as it always was: Keep the tires properly inflated, to cut rolling resistance.

This reduces rolling resistance at the cost of less damage protection.

Also, sand on the ground will give more rolling resistance than concrete.

There are at least two popular models for calculating rolling resistance.

A tire that's inflated harder has less rolling resistance, and thus more speed.

Often one front wheel is raised slightly so that it does not contact the track and add to the rolling resistance.

It's important to value the rolling resistance in relation to the drag force.

We set out to reduce the cars' rolling resistance.