Families could save up to £270 a year if they adopt smarter driving practices.
Research carried out by the Energy Saving Trust (EST) has discovered that people in England are collectively wasting £6.6 billion annually because of their poor driving styles.
Shifting up through the gears early, removing roof racks, keeping tyres correctly inflated and driving in a smooth manner are among the top tips issued by the body to cut down on fuel consumption.
Tim Anderson, senior knowledge manager for transport at the body, said it is very easy for people to alter their style behind the wheel.
"Motorists who take simple steps to change the way they drive will soon see a return on their investment," he added.
RAC technical director David Bizley added people are already starting to drive in a more economical manner, but there is still progress to be made.
In order to spread this message, the EST has launched a three-month campaign called Fuel Your Passion that aims to show consumers what items they could buy with the cash they will be saving.