Electric vs Petrol vs Hybrid: Which Used Car Should You Buy?

Overview of Each Powertrain

The used car market now offers four main powertrain types, each with distinct advantages and trade-offs. Understanding these differences is essential before you start shopping — the right choice depends on how you drive, where you live, and what you can afford.

Petrol

The most common powertrain on the used market. Petrol engines burn fuel in an internal combustion engine (ICE) to drive the wheels. They are well-understood, widely supported, and available in every price range.

Diesel

Also an ICE powertrain, but diesel engines use compression ignition rather than spark plugs. Diesel cars are typically more fuel-efficient for long-distance driving but face increasing scrutiny over emissions.

Hybrid

Hybrids combine a petrol (or occasionally diesel) engine with an electric motor and battery. There are two main types:

• Mild hybrid (MHEV) — a small electric motor assists the engine but cannot drive the car alone. The benefit is modest fuel savings.
• Full hybrid (HEV) — the electric motor can drive the car at low speeds for short distances. The Toyota Prius is the classic example.
• Plug-in hybrid (PHEV) — a larger battery that can be charged from a plug, offering 20–40 miles of pure electric range. After that, it operates like a regular hybrid.

Electric (EV)

Fully electric cars have no combustion engine. They run entirely on battery power and are charged from the mains, a home charger, or a public charging station. Range varies from around 100 miles on older models to 300+ miles on newer ones.

Petrol Cars

Pros

• Cheapest to buy used — the largest selection and most competitive prices on the second-hand market.
• Simple and proven technology — petrol engines have been refined over more than a century. Mechanics understand them, parts are cheap, and reliability is well-documented.
• Good for mixed driving — petrol works well for short trips, city driving, and longer journeys alike.
• No charging infrastructure needed — fill up at any petrol station in minutes.
• Lower purchase costs — for the same budget, you can generally get a newer or lower-mileage petrol car compared to an EV or PHEV.

Cons

• Higher fuel costs per mile than diesel or electric — especially for motorway-heavy driving.
• Higher emissions than hybrid or electric — relevant for congestion charges (ULEZ, LEZ) and environmental considerations.
• Depreciation on older models — as the market shifts towards electrification, purely petrol cars may depreciate faster in the long term.
• Road tax may increase — government policy is gradually penalising higher-emission vehicles.

Best Use Cases

Petrol is ideal if you drive under 12,000 miles per year, do a mix of town and country driving, want the simplest and most affordable ownership experience, and do not regularly drive into low-emission zones.

Diesel Cars

Pros

• Better fuel economy on motorways — diesel engines are more efficient at constant highway speeds, typically returning 50–70mpg.
• Higher torque — diesels produce more pulling power at low revs, making them well-suited for towing, carrying heavy loads, or driving larger vehicles.
• Longer engine life — diesel engines are built to withstand higher compression and often last longer in terms of mileage.
• Good used values for high-mileage examples — a well-maintained diesel with 100,000+ miles still has plenty of life.

Cons

• Falling demand — diesel cars are less popular with buyers, which affects resale values.
• ULEZ and clean air zone charges — older diesels (pre-Euro 6, typically pre-September 2015) face daily charges in London and other cities.
• DPF issues — the diesel particulate filter (DPF) can clog up if the car is used mainly for short trips. DPF replacements are expensive (£1,000–2,500).
• Higher servicing costs — diesel engines typically cost more to service due to additional components (DPF, EGR valve, turbo).
• AdBlue — many modern diesels require AdBlue top-ups, an additional running cost (though a minor one).

Best Use Cases

Diesel is best if you drive 15,000+ miles per year, do predominantly motorway driving, tow caravans or trailers, and do not regularly drive into clean air zones.

Hybrid Cars

Pros

• Lower fuel consumption than equivalent petrol — particularly in urban and stop-start driving where the electric motor does more work.
• Lower emissions — hybrids (especially PHEVs) produce fewer CO2 emissions, which can mean lower road tax and exemptions from some congestion charges.
• No range anxiety — unlike pure EVs, hybrids have a petrol engine as backup. You never need to worry about finding a charger.
• Plug-in hybrids offer electric-only commuting — if your daily commute is under 25–30 miles, a PHEV can run almost entirely on electricity for daily use.
• Regenerative braking — the electric motor recaptures energy when braking, improving efficiency and reducing brake wear.

Cons

• Higher purchase price — hybrid versions of a car typically cost £1,000–3,000 more than the equivalent petrol.
• Battery degradation — hybrid batteries do degrade over time, though this is usually gradual. Replacement costs can be high (£1,500–5,000), but most last well beyond 100,000 miles.
• Weight — the battery and electric motor add weight, which can slightly reduce handling agility and increase tyre wear.
• PHEVs are only efficient if you plug them in — if you never charge a PHEV, it is essentially a heavier, more expensive petrol car with worse fuel economy. This is a common trap for used PHEV buyers.
• Complexity — more components mean more potential failure points, though reliability records for Toyota and Lexus hybrids in particular are excellent.

Electric Cars

Pros

• Lowest running costs — electricity is significantly cheaper per mile than petrol or diesel. Home charging can cost as little as 3–5p per mile; even public charging is usually cheaper than fuel.
• Zero tailpipe emissions — no exhaust means no congestion charges, no ULEZ fees, and a smaller environmental footprint.
• Free or reduced road tax — pure EVs registered before April 2025 pay zero road tax. After that, standard rates apply to new registrations but used EVs bought earlier retain the exemption.
• Quiet and smooth — electric motors produce instant torque and virtually no noise. The driving experience is refined and effortless.
• Lower maintenance costs — no oil changes, no spark plugs, no exhaust system, no clutch. Brake wear is reduced thanks to regenerative braking. Servicing is simpler and cheaper.
• Government incentives — while purchase grants have been reduced, workplace charging schemes and home charger grants may still be available.

Cons

• Higher purchase price — even used EVs command a premium over petrol equivalents, though the gap is narrowing.
• Range limitations — older used EVs (2016–2019) may only offer 80–150 miles of range. Newer models reach 200–300+ miles, but these are more expensive.
• Charging infrastructure — home charging is ideal, but if you rely on public chargers, availability and reliability can be inconsistent. Not all areas have adequate coverage.
• Charging time — even rapid chargers take 20–45 minutes for an 80% charge. Home charging overnight is convenient but requires off-street parking and a dedicated charger.
• Battery degradation — all batteries lose capacity over time. A used EV may have less range than when new. Most manufacturers warrant the battery for 8 years / 100,000 miles.
• Resale uncertainty — the EV market is evolving quickly, and today's models may depreciate faster as newer, longer-range vehicles become available.
• Tyre costs — EVs are heavier and produce instant torque, which increases tyre wear. EV-specific tyres can be more expensive.

Running Cost Comparison

Cost Factor	Petrol	Diesel	Hybrid	Electric
Fuel/energy per mile	12–16p	10–14p	8–12p	3–7p
Annual fuel (10,000 mi)	£1,200–1,600	£1,000–1,400	£800–1,200	£300–700
Road tax	£0–590	£0–590	£0–590	£0 (pre-2025 reg)
Servicing (annual)	£150–300	£200–400	£150–350	£80–200
Insurance	Standard	Standard	Slightly higher	Higher
ULEZ compliant	Euro 4+ (post-2005)	Euro 6 (post-2015)	Usually yes	Always

Figures are approximate and depend on the specific vehicle, driving style, and energy costs.

Reliability Considerations

• Petrol — well-proven and generally reliable. Issues are well-understood and cheap to fix. Turbo petrol engines can be slightly less reliable than naturally aspirated ones.
• Diesel — mechanically durable but the DPF, EGR valve, and turbo are common failure points. Proper maintenance is essential.
• Hybrid — Toyota and Lexus hybrids have an exceptional reliability record. Other brands are improving but have less long-term data. The hybrid battery is the main concern, but failures are relatively rare.
• Electric — fewer moving parts means less to go wrong mechanically. Battery degradation is the primary long-term concern, but most batteries outlast the 8-year warranty. However, if something does go wrong, EV-specific repairs can be expensive.

Depreciation Differences

• Petrol — standard depreciation. Cheap to buy used, predictable value.
• Diesel — depreciating faster than petrol due to falling demand and emission concerns. This means good deals on the used market but potentially lower resale values.
• Hybrid — holding value well, especially Toyota/Lexus models. PHEVs can depreciate quickly if they are no longer eligible for company car tax benefits.
• Electric — depreciation has been steep on early models with limited range. Newer EVs with 200+ miles of range are holding value better, but the market is volatile as technology improves.

Charging and Infrastructure Factors

If you are considering an EV or PHEV, think about:

• Home charging — do you have off-street parking? A home charger (7kW) costs around £800–1,000 installed and is by far the cheapest and most convenient way to charge.
• Workplace charging — does your employer offer charging? This can make a huge difference to daily running costs.
• Public charging availability — check the coverage in your area using apps like Zap-Map. Urban areas are well-served; rural areas can have gaps.
• Charging speed — a 7kW home charger fills a typical EV in 6–10 hours overnight. Rapid chargers (50kW+) provide 80% in 20–45 minutes.
• Cost of public charging — rapid chargers can cost 60–80p per kWh, which significantly reduces the running cost advantage of electric.

Which Type Suits Different Drivers

Driver Profile	Best Choice	Why
Low mileage, mixed driving	Petrol	Cheapest to buy and insure, simple ownership
High mileage, mostly motorway	Diesel	Best fuel economy at constant speeds
Urban commuter, short trips	Hybrid or EV	Electric mode in cities, lowest urban running costs
Short commute with home charging	Electric	Cheapest per mile, zero emissions
Long distances without reliable charging	Petrol or Diesel	No range anxiety, fast refuelling
Budget-conscious first-time buyer	Petrol	Lowest purchase price, most choice
Company car driver	PHEV or EV	Significant BIK tax savings
Towing or heavy loads	Diesel	Best torque and towing efficiency

There is no single "best" powertrain — only the best one for your specific situation. Consider your daily driving, access to charging, budget, and how long you plan to keep the car. And regardless of what you choose, always run a vehicle check before buying.