• Anticipate the road ahead. Drive smoothly and try to avoid breaking or accelerating hard.

• The most economical speed is 55-65mph, say the EST. Any faster, and fuel efficiency falls rapidly. For example, driving at 85mph uses 40% more fuel than at 70mph.

• Turn off the air-con, which increases fuel use. At speeds of less than 40mph, opening the window slightly won’t really affect economy.

• Under-inflated car tyres can increase fuel consumption by up to 3%, so check their pressure on a regular basis.