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

A new ‘E-Rating’ has been launched that ranks each model on sale in Britain for how efficiently they use electricity, claiming there is a £500 gulf in annual charging costs between the best and worst cars.

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

Most efficient EVs revealed: A new E-Rating system to tell consumers how frugal different electric models are has been launched, with the Tesla Model 3 scoring a top A++ rating

BMW’s i4 saloon, which has a range of up to 365 miles, has also been given the highest rating in the new scale

The website, which provides information and advice to electric car buyers and existing owners, says the aim of the E-Rating is to give consumers clarity about which EVs will be better to 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 to understand the overall efficiency of an electric car.

With the public well-versed on energy labels from all things from washing machines to EPC scores for properties, the E-Rating is a similar scaled system to inform buyers which cars are ahead of others.

Each EV’s rating is calculated using an algorithm that incorporates a number of factors.

The E-Rating scale works similarly to energy labels from all things 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 the battery can be recharged and if it includes features to help minimise power use, such as heat pumps, intelligent brake energy recuperation and climate control preconditioning.

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

Proving that it’s not just about price, the £100,000 Mercedes EQS luxury saloon gets the same A+ rating as the dinky – and cheap – Citroen Ami (approx £6,000) and Renault Twizy (approx £12,000) quadricycles, and Seat’s £20,000 (inclusive of the £25,000 Plug-in Car Grant) Mii Electric city car.

These four vehicles are among 13 models to achieve A+ ratings, with a further 14 performing well enough to earn an A.

The E-Ratings don’t factor in vehicle price, so the luxury Mercedes EQS saloon (left) – which starts from £100,000 in the UK – has the same A+ rating as the £6,000 Citroen Ami quadricycle (right)

At the other end of the scale, the Mercedes EQV people carrier – which has a 213-mile range and £71,645 costs a whopping  is the only vehicle to obtain 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 to cover 10,000 miles between the A++ rated BMW i4 and the E-graded Mercedes EQV 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 electric cars that sit within the same segment.

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

Besides the extra cost, owners will find themselves waiting for a charge much longer in the least efficient cars – partly because they use more energy to move, but also because they can take charge at a slower rate. 

E-Ratings for electric cars on sale in Britain 

Tesla Model 3: A++

BMW i4: A++

Hyundai Ioniq: A+

Seat Mii: A+

Vauxhall Mokka: A

Mercedes EQC: D

Source: Electrifying.com 

A Vauxhall Mokka can take on power at twice the speed of a Mazda MX-30, for example, while the newest Hyundai and Kia models can add 60 miles of range in under five minutes.   

With sales of EVs booming, the total number of electric vehicles on the road in the UK is set to top 300,000 before the end of 2021. 

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

The Mercedes-Benz EQV people carrier is the only EV so far to be awarded the lowest ‘E’ E-Rating

The Audi e-tron premium SUV – which costs from just over £60,000 – has been given an efficiency rating of D

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

The new efficiency rating has been backed by AA president Edmund King.

Commenting on its arrival, he said: ‘Anything that helps consumers decide on the most efficient EV for their needs in simple terms can only be a positive thing.

‘Drivers need to research a range of factors based on their individual needs before deciding on any type of vehicle, and efficiency is a major factor for many.’ 

Ginny Buckley, founder of the EV-dedicated website, said the rating is aimed at not only informing consumers about which electric models are most frugal but also push manufacturers to make improvement 

‘It amazes me that until now we haven’t had an effective efficiency standard for electric cars, as we do across other sectors; but we’ve looked to put this right.

‘As electricity costs less than petrol or diesel, it is easy to dismiss the efficiency of electric cars and think it isn’t important. But the costs of a less efficient model can soon add up. 

‘Perhaps more importantly, an electric car that is more frugal will go further and spend less time charging, meaning greater convenience for consumers.’ 


This content was originally published here.