Carrying weight reduces an EV's range, but towing is the big one: most EVs lose 35-60% of their range when towing, and 40-60% when pulling a heavy trailer at highway speed. Lighter or aerodynamic loads cost less — closer to 25-40%. The culprit is mostly aerodynamic drag (a trailer is a wall of air resistance), plus added weight and motor load. Payload alone — passengers and cargo inside the car — has a smaller effect, often a few percent to ~10-15% when heavily loaded. Plan trips assuming roughly half your normal range when towing heavy, and charge more often.
Range impact of load and towing
| Scenario | Typical range loss | Main cause |
|---|---|---|
| Heavy passengers/cargo | ~5-15% | Added weight, rolling resistance |
| Light/aero trailer | ~25-40% | Drag + weight |
| Heavy trailer, highway | ~40-60% | Aerodynamic drag dominates |
| Near max tow capacity | ~up to 50%+ | Drag + weight + motor load |
| Roof/box load | Varies (drag-driven) | Aerodynamic drag |
Payload vs towing: two different effects
It helps to separate two things people lump together. Payload is the weight you put inside or on the car — passengers, luggage, a roof box. Towing is pulling a trailer or caravan behind it. Both reduce range, but they do so by different amounts and for different reasons, and towing is by far the bigger hit because of aerodynamics.
How much range does towing cost?
This is where EVs differ most from petrol cars. Real-world testing consistently shows most EVs lose 35-60% of their unloaded range when towing, with 40-60% typical for a full-size camper or heavy trailer at highway speed. Lighter, smaller or more aerodynamic loads are gentler, often 25-40%. The practical rule of thumb: when towing something substantial, plan for roughly half your normal range.
| Trailer (example: Ford F-150 Lightning) | Weight | Observed range |
|---|---|---|
| No trailer (baseline) | - | ~255 miles |
| Light trailer | ~3,100 lb | ~115 miles |
| Medium trailer | ~5,300 lb | ~100 miles |
| Heavy trailer | ~7,200 lb | ~90 miles |
Those figures (from published testing) show how steeply range falls — a heavy trailer can cut a 255-mile truck to around 90 miles. Other big EV pickups show the same pattern: towing near maximum capacity commonly roughly halves range.
Why the hit is so big
Three factors compound, and the first dominates:
- Aerodynamic drag: a trailer is essentially a brick wall of air resistance, and drag rises sharply with speed. At highway speeds this is the single biggest drain — which is why a tall, boxy caravan costs far more range than its weight alone suggests.
- Added weight: more mass means more rolling resistance and more energy to accelerate, especially in stop-start driving and on hills.
- Motor load: the drivetrain works harder and draws more power per mile, and there's less opportunity to recover energy through regenerative braking.
Because drag scales with speed, slowing down is the most effective single lever: towing at 55 mph instead of 70 can claw back a meaningful chunk of range.
What about payload inside the car?
Loading the cabin and boot with people and cargo has a real but smaller effect — typically a few percent up to around 10-15% when heavily loaded. Weight increases rolling resistance and the energy needed to accelerate, but it doesn't add the huge aerodynamic penalty a trailer does. A roof box or roof-mounted bikes, by contrast, behave more like towing because they hurt aerodynamics: even a light roof box can dent range noticeably at speed.
When towing anything heavy, plan your route as if you have roughly half your normal range. Map chargers closer together, and remember many fast chargers aren't pull-through — a trailer may need unhitching, so factor in time and check charger layouts in advance.
How to minimise the range loss
- Slow down — drag is the dominant factor, so reducing highway speed by 10-15 mph recovers significant range.
- Choose the most aerodynamic trailer you can; height and frontal area matter more than weight for drag.
- Keep payload sensible and load the car evenly; remove roof boxes when not in use.
- Precondition and keep tyres correctly inflated, including the trailer's.
- Charge to 100% before towing trips (LFP) or as your chemistry allows, since you'll have less buffer.
- Plan charging stops closer together and check whether stations accommodate a trailer.
Should towing put you off an EV?
Not necessarily — but it should shape your expectations and route planning. For occasional light towing, a modern long-range EV copes well. For frequent heavy towing over long distances, the range penalty and charging logistics are real, and the towing-capable EV pickups, while impressive, will need more frequent stops than a diesel equivalent. As with so much of EV ownership, the right answer depends on your specific use: be honest about how heavy, how far and how often you tow.
Frequently asked questions
How much range does an EV lose when towing?
Why does towing hurt EV range so much?
Does carrying passengers and cargo reduce EV range?
How can I reduce range loss while towing?
Can EVs tow heavy trailers at all?
Sources & further reading
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