This year marks the 30th anniversary of Shell Eco-marathon Europe, which started in France in 1985. Students who engineer and drive cars that could complete the Le Mans 24 hours on just over a litre of fuel were on track at the world’s most famous motor race on Wednesday, 10 June. Staking a claim to be the most energy-efficient vehicles ever to roll a wheel on the hallowed Le Mans tarmac, the Shell Eco-marathon vehicles built by teams of French students have achieved up to 3,771 km per litr...