What is a mild hybrid car?
Mild hybrid cars are a popular alternative to traditional petrol and diesel models. They’re greener and more efficient without the complexity of a full hybrid or electric system. But what else sets mild hybrids apart from other hybrid options?
This guide will examine how mild hybrid cars work, explore their advantages, and help you decide if a mild hybrid should be your next lease car.
How Does a Mild Hybrid Work?
A mild hybrid car couples a traditional internal combustion engine with a small electric motor and a battery. Unlike full hybrids or plug-in hybrids, mild hybrids cannot run on electric power alone. Instead, the electric motor helps the engine during start-up, acceleration, or idling. This puts less strain on the engine, improving fuel efficiency and lowering emissions.
Some key features of a mild hybrid engine include:
- Regenerative Braking: The car’s electric battery charges through energy captured during braking.
- Idle Stop/Start Technology: The engine automatically shuts off when the car is stationary and restarts seamlessly when needed.
Mild Hybrid vs Hybrid: What’s the Difference?
Mild and full hybrids aim to improve fuel efficiency, but they work differently.
| Feature | Mild Hybrid | Full Hybrid |
Electric-Only Driving
| No | Yes |
Battery Size
| Smaller | Larger |
Charging Method
| Regenerative braking only | Regenerative braking, self-charging and plug-in |
Cost
| Typically lower | Higher due to advanced technology |
For further information on hybrid technology, check out our guide on how hybrid cars work or explore the best hybrid cars to lease in 2024. 
What Are the Benefits of a Mild Hybrid?
Mild hybrid cars offer many benefits, especially for drivers seeking a greener and more practical option.
Improved Fuel Efficiency
The electric motor reduces the workload on the engine, leading to better fuel economy, especially in stop-start traffic.
Reduced Emissions
Lower emissions make mild hybrids a more environmentally friendly. For example, the Ford Puma range now comes as standard with an ‘EcoBoost Hybrid’ setup, increasing fuel economy to 52mpg on certain trim levels.
No Need for Charging Points
Unlike plug-in hybrids or electric cars, mild hybrids charge their batteries through regenerative braking, eliminating the need for external charging.
Easy to Drive
Mild hybrids are as easy to drive as traditional petrol or diesel cars without charging the battery or adjusting your driving habits. The new Suzuki Swift uses a mild hybrid three-cylinder engine, making it a compact, fuel-efficient option ideal for city driving. 
Are Mild Hybrids Exempt from Tax?
In the UK, mild hybrids are not tax-exempt. However, they can qualify for lower rates of Vehicle Excise Duty (VED) than conventional cars, and the exact tax savings depend on the model’s CO2 emissions.
Are Mild Hybrids Reliable?
Yes, mild hybrids are generally considered reliable. Because their systems are more straightforward than those of full or plug-in hybrids, they are less prone to expensive repairs. Mild hybrids use a traditional combustion engine that has been used in petrol and diesel cars for years, meaning they are reliable, easy to maintain, and simple to service.
Learn More About Mild Hybrids with Synergy
Synergy offers a wide range of mild hybrid cars to match any need or budget. Whether upgrading your business fleet or cutting fuel costs for your commute, our expert team is ready to help you find the ideal model.
Contact us today to explore your mild hybrid leasing options.
