Most efficient electric cars revealed: New rating system ranks BMW i4 and Tesla Model 3 top but models from Audi and Mercedes are considered worst

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  • New e-Rating launched to inform buyers which EVs are most efficient
  • A rating from A++ to E, similar to the rating used for asset EPCs and white goods
  • Efficiency ratings calculated using algorithms based on optimum power usage, charging speed and on-board features to make electric vehicles more economical

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Electric vehicles are generally considered to have better environmental benefits than petrol and diesel cars – but which EVs are the most efficient?

A new ‘e-rating’ has been launched that ranks each model on sale in the UK according to how efficiently they use electricity, claiming it ranks among the best and worst cars There is a £500 gap in annual charging costs.

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Of the 49 models already rated by Electrifying.com, the BMW i4 and Tesla Model 3 receive the highest A++ rating, while at the bottom of the list is the Mercedes EQV MPV – the only car to receive the lowest E rating.

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Most Efficient EV Revealed: A new e-rating system to let consumers know how various electric models have been launched, with the Tesla Model 3 topping the A++ rating

BMW's i4 saloon with a range of up to 365 miles has also been rated the highest in the new scale.

BMW’s i4 saloon with a range of up to 365 miles has also been rated the highest in the new scale.

The website, which provides information and advice to electric car buyers and existing owners, says the purpose of e-ratings is to make it clear to consumers which EVs would be a better fit for their bank accounts.

While motorists understand the concept of miles per gallon for petrol and diesel motors, there is no industry-standard figure to help drivers understand the overall efficiency of an electric car.

With the public well-versed on energy labels from everything from washing machines to EPC scores for properties, e-ratings are a similar scale system to inform buyers which cars are ahead of others.

The rating of each EV is calculated using an algorithm that includes a number of factors.

The e-rating scale works in the same way as energy labels for everything from washing machines to EPC scores for properties.

The e-rating scale works in the same way as energy labels for everything from washing machines to EPC scores for properties.

This includes how well electrical power is converted into miles on the road, the speed at which batteries can be recharged and if it includes features to help reduce electricity use, such as Heat pump, intelligent brake energy recovery and climate control preconditions.

So far, only the BMW i4 – from £51,905 and with a range of up to 365 miles – and the Tesla Model 3 – priced from £42,990 and with a range between 305 and 360 miles (depending on spec) – have qualified at present. Out of the maximum A++ rating for EVs for sale in the UK.

Proving that it’s not just about the price, the £100,000 Mercedes EQS luxury saloon gets the same A+ rating as the dinky – and cheaper – Citron Amy (around £6,000) and Renault Twizy (around £12,000) quadricycles, and Seat’s £20,000 (inclusive of £25,000 plug-in car grant) Mii Electric City Car.

These four vehicles are among the 13 models earning an A+ rating, of which 14 vehicles are performing well enough to earn an A.

The Mercedes EQS, which starts at £100k, has an A+ E-Rating of .  Is

Citroen's £6,000 Ami city car - with a range of just 46 miles - gets the same A+ rating

The E-rating doesn’t factor into the price of the vehicle, so the luxury Mercedes EQS saloon (left) – which starts at £100,000 in the UK – has the same A+ rating as the £6,000 Citron Amy quadricycle (right).

At the other end of the scale, the Mercedes EQV people carrier – which has a 213-mile range and costs £71,645 – is the only vehicle to have received the lowest E rating, while the Audi e-tron (from £60,560) and Mercedes EQC (from £64,925) ) Luxury SUVs were rated D.

Based on miles per kilowatt hour alone, Electrifying.com calculated the cost difference between an A++-rated BMW i4 and an E-graded Mercedes EQV to cover 10,000 miles to be £580.

While the Mercedes People Carrier and BMW Family Saloon are not competing in the same class, there are still big differences between the electric cars that sit in the same segment.

For example, based on calculations, a Tesla Model Y (rated A+) will cost £176 less than a Volvo XC40 recharge with over 10,000 miles.

In addition to the added cost, owners will wait longer in the least efficient cars to charge themselves – partly because they use more energy to move, but also because they can take a slower charge. Huh.

E-ratings for electric cars on sale in the UK

Tesla Model 3: A++

BMW i4: A++

Hyundai Ionic: A+

Citroen E-C4: A+

Fiat 500e: A+

Hyundai Kona Electric: A+

Mercedes EQS: A+

Kia EV6: A+

Peugeot E208: A+

Seat Mi: A+

Tesla Model Y: A+

Vauxhall Corsa-E: A+

Citroen Ami: A+

Volkswagen ID .3: A+

Renault Twizy: A+

Hyundai Ionic 5: A+

Audi Q4 e-tron, a

BMW IX3: a

DS3 Crossback: a

Ford Mustang Mach E: a

Kia e-Niro: a

Kia Spirit: a

Peugeot E2008: a

Renault Zoe: a

Skoda Anac: a

Smart For Two EQ: a

Tesla Model S: a

Tesla Model X: a

Vauxhall Mocha: a

Volkswagen ID.4: a

Audi e-tron GT: NS

BMW i3: NS

Mercedes EQA: NS

MG MG5 EV: NS

MG ZS EV: NS

Nissan Leaf: NS

Polestar 2: NS

Volvo XC40 Recharge: NS

Honda and: C

Jaguar I-Pace: C

Lexus UX300e: C

Mazda MX-30: C

Porsche Taycan: C

Remake Fridge: C

Citroen E-SpaceTourer: C

Vauxhall Vivaro-E: C

Audi e-tron: D

Mercedes EQC: D

Mercedes EQV: I

Source: electrification.com

For example, a Vauxhall Mokka can power twice the speed of a Mazda MX-30, while the latest Hyundai and Kia models can add 60 miles of range in less than five minutes.

With EV sales booming, the total number of electric vehicles on the road in the UK is expected to reach 300,000 before the end of 2021.

Electrifying.com claims that nationally, the difference in cost between charging the lowest and least efficient cars represents an estimated £155 million annually in electricity costs.

The Mercedes-Benz EQV people carrier is the only EV ever awarded the lowest 'E' E-rating

The Mercedes-Benz EQV people carrier is the only EV ever awarded the lowest ‘E’ E-rating

The Audi e-tron premium SUV - which costs just over £60,000 - was called the D.  given an efficiency rating of

The Audi e-tron premium SUV – which costs just over £60,000 – was called the D. given an efficiency rating of

The Mercedes EQC - the rival of the Audi e-tron in the luxury SUV segment - was also given a D rating by Electrifying.com.

The Mercedes EQC – the rival of the Audi e-tron in the luxury SUV segment – was also given a D rating by Electrifying.com.

The new efficiency rating has been given…

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