With the increasing number of electric vehicles (EVs) available, buyers are looking for the most energy-efficient options to maximize their battery life between charges. Electric car efficiency is measured by miles per kilowatt hour used (mpkWh), and factors like weight and aerodynamics play a significant role in determining an EV’s efficiency.

For example, the Volkswagen ID 3, with a 77kWh battery, would need an efficiency of 4.5mpkWh to achieve its rated range of 347 miles. On the other hand, the Audi Q8 E-tron, powered by a 106kWh battery, only achieves around 2.9mpkWh due to its heavy weight of 2585kg. Additionally, larger SUV-style EVs are affected more by drag, which reduces their range compared to more aerodynamic sports cars and hatchbacks.

Weather conditions and outside temperatures also impact range and efficiency. Warmer temperatures allow for faster battery reactions and higher range, while colder weather increases energy demand and reduces range. Other factors, such as driving speed, use of climate control or air conditioning, and road type (city driving vs. motorway), also affect an EV’s range.

So, what are the most efficient electric cars available today? Here are some examples:

Peugeot e-308

Claimed efficiency: 4.9mpkWh

Autocar’s test efficiency: tbc

The Peugeot e-308, expected to be available in October 2023, is touted by Peugeot as “a benchmark among 100% electric vehicles in the C-segment.” Peugeot claims that with the e-308’s EV-specific redesign, low-friction tires, and aerodynamic wheel options, it can achieve an efficiency of 4.8mpkWh in hatchback form. Real-world tests will determine if it lives up to this claim and potentially make it the most efficient electric car on the market.