The research, from What Car?, found the Mercedes-Benz C300e to be the most fuel-efficient car currently on sale in the UK. The vehicle averaged 470.8 mpg in official WLTP fuel consumption and emissions tests.
The C300e, a plug-in hybrid, can also travel up to 62 miles on electric alone.
The widespread availability of hybrid and plug-in hybrid vehicles (PHEV) means that some of the newest cars are capable of astonishing fuel efficiency.
Luxury brands dominate the top of the rankings with Mercedes-Benz, Volvo, Land Rover and Lexus occupying the top four spots.
Cars from the top 10 brands come from a range of classes – from family sedans to luxury SUVs.
Which car? editor Steve Huntingford commented on the data, saying drivers were in a difficult position with rising fuel prices.
He said: “With the rising cost of living, things like fuel economy are an increasingly important consideration for car buyers.
“The good news is that modern PHEVs, in particular, are capable of incredible efficiency if you do mostly short trips and plug them in regularly.”
The latest data from RAC Fuel Watch shows drivers are paying an average price of 188.74p per liter of unleaded petrol, although prices are ‘expected to come down’.
Diesel drivers are slightly worse off, paying an average of 196.36p for a litre, as the RAC predicts further cost increases are likely.
Premium unleaded petrol has broken through the £2 barrier, those opting for premium fuels are seeing costs of 200.25p per litre.
RAC fuel spokesman Simon Williams said: ‘The average price of petrol rose further on Sunday to a new record high of 188.7 pa litre.
“More than five weeks of successive record prices pushed the liter of unleaded up 23p to 165.5p in mid-May.
“This is still bad news for drivers, especially with the rail strikes this week leaving many people with no choice but to use their cars.
“But looking at the wholesale price of gasoline, which has leveled off due to the drop in the price of oil, prices at the gas pump really shouldn’t continue to rise, rather they should start to fall.
“Unfortunately the diesel seems destined to move quickly towards an average of £2 a litre, which would make a full tank £110.
“We very much hope that the scale of the increases seen in both fuels will finally compel the Government to take action to ease the burden on drivers by further reducing duty or mitigating the punitive impact of VAT which currently stands at 31p per liter gasoline – 6p more than it was before the start of the Ukrainian war.
The Competition and Markets Authority (CMA) is currently carrying out an “urgent review” of fuel prices.
The 10 most fuel-efficient models by brand
Mercedes-Benz C300e – 470.8mpg
Volvo S60 Recharge T8 PHEV – 403.0mpg
Land Rover Range Rover Sport P440e – 341.2 mpg
Lexus NX 450h+ – 319.9mpg
Volkswagen Golf 1.4 TSI eHybrid – 319.9mpg
Skoda Octavia 1.4 TSI iV – 282.5mpg
Toyota RAV4 2.5 PHEV – 282.4mpg
Suzuki Across 2.5 PHEV E-Four – 282.4mpg
Peugeot 308 1.6 Hybrid 180 – 281.1mpg
Ford Kuga 2.5 PHEV – 257.0mpg
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