A team of researchers at Cardiff University set out to answer a question that nags every parent scrolling through used-car listings: which second-hand family vehicle actually delivers the best combination of safety, space, running costs, and value? Their answer may surprise buyers on both sides of the EV debate. The Tesla Model Y RWD topped the ranking, beating nine combustion and hybrid rivals, in a study published by the Centre for Automotive Industry Research.
The study scored each car out of 100 possible points across a battery of practical criteria. Only vehicles priced under £25,000 for a three-year-old example qualified. Every model on the list is a 2023 build, the kind of lightly used inventory now flooding dealer lots and online platforms.
What makes the ranking unusual is its method. Rather than relying on journalist road tests or owner sentiment surveys, the Cardiff researchers weighted hard numbers: affordability, dimensions, boot space, Euro NCAP crash-test rating, warranty duration on a three-year-old example, pence-per-mile running costs, insurance group, and depreciation. Bonus points went to cars that came standard with family-oriented features such as lane-departure warning, cupholders, and USB access for rear-seat passengers.
The Model Y RWD scored 58 out of 100, the highest mark in the field. Professor Peter Wells, who directs the Centre for Automotive Industry Research, said the Tesla earned perfect ten-point scores in three categories: safety, warranty, and boot volume. Its average second-hand price for a 2023 model sits at £22,428, according to data from Cazoo, comfortably under the £25,000 ceiling.
Professor Wells framed the result as a data exercise, not a sales pitch. He told reporters:
"With so much opinion available on the 'best' cars, it's always been tricky for consumers to navigate the buying decision. This new top ten list identifies the hard facts that family car buyers care about."
He added that the Tesla's win came down to balance rather than any single standout trait.
"Despite being a more pricey option, the car meets that ideal balance between value and quality."
That balance owes a lot to the economics of electric drivetrains. The study noted that EVs' strong overall performance was "largely led by their low per-mile running costs and long battery warranty periods." Used EVs also benefit from steep depreciation curves, buyers pick up premium features for a fraction of the original sticker price.
For families weighing whether to go electric on the used market, the broader landscape of car-buying rankings is shifting in the same direction, with data-driven guides increasingly favoring battery-powered models on cost-per-mile grounds.
Below the Model Y, the spread is tight, and the mix of powertrains is telling. Half the top ten are hybrids or fully electric. The other half run on petrol. Here is the complete list with scores:
The Ford Focus, a perennial family workhorse, grabbed second place at 53 points, proving that a well-sorted petrol hatchback still competes when the math is done honestly. The Vauxhall Corsa's electric variant landed third, while the Mazda CX-30 offered a compact-SUV option for families who want a higher driving position without going hybrid.
No car cracked 60 out of 100. That gap between the top score and a perfect mark tells its own story: the used family-car market is full of trade-offs. Even the best options force buyers to compromise somewhere, whether on purchase price, running costs, or feature count.
The Range Rover Evoque plug-in hybrid at fifth place is a case in point. Its premium badge and part-electric drivetrain earned it a spot, but at 44 points it trails the humble Ford Focus by nine. Prestige alone does not move the needle when researchers weight insurance groups and depreciation equally alongside badge appeal.
Affordability pressures across the broader auto market make studies like this more relevant than ever. Families shopping for a used vehicle want to know that the numbers hold up, not just that a car looks good on a showroom floor.
The two Volkswagen entries, the electric ID.3 and the petrol Golf, tied at 39 points, separated only by decimal dust. That near-identical result between an EV and its combustion sibling from the same manufacturer underscores how closely matched the two powertrains can be once depreciation and running costs are factored in.
Professor Wells acknowledged the electric tilt in the results but stopped short of declaring combustion engines obsolete for family buyers. He described a "clear strength of EVs" in the data, driven by low per-mile costs and generous manufacturer warranties that still cover three-year-old examples.
Yet the study also found that those EV models "benefitted by combining relative affordability with high-spec features." In plain terms: electric cars depreciate faster than petrol equivalents, which means second-hand buyers inherit leather seats, big screens, and advanced driver-assist systems at a steep discount.
That dynamic matters in a market where major automakers are recalibrating their EV strategies and new-car EV demand has softened in some segments. For the first owner, heavy depreciation stings. For the second owner hunting a family hauler under £25,000, it is a gift.
Wells urged families not to fixate on the top slot alone:
"It's worth looking into several on the top 10 list, as each will provide a feature beneficial to family life."
That is sensible advice. A family that needs maximum boot space may land on a different winner than one prioritizing the lowest insurance group. The scores provide a framework, not a verdict.
The Cardiff study does not disclose the precise weighting system that produced its 100-point scale. Readers know which categories were measured, safety, warranty, boot space, running costs, depreciation, insurance, dimensions, and standard features, but not how many points each category carried. That matters. A system that weights warranty duration heavily will naturally favor EVs with eight-year battery guarantees over petrol cars with three-year bumper-to-bumper coverage.
The study also does not specify whether charging infrastructure, real-world range anxiety, or regional electricity costs factored into the running-cost calculation. For a family in rural Wales, the pence-per-mile figure for a Tesla looks different than it does for a household with a home charger in suburban London.
None of that invalidates the ranking. But buyers should treat the list as one input among several, exactly as Wells suggested. The shifting strategies of global automakers remind us that the EV market is still evolving, and today's depreciation bargain could look different in five years.
The Cardiff study's real value is not crowning a single champion. It is the reminder that buying a family car on gut feeling, brand loyalty, or social-media hype leaves money on the table. Hard data, crash ratings, insurance brackets, warranty terms, cost per mile, tells a clearer story than any influencer review.
The used-car market rewards patience and homework. Platforms like online used-car retailers have made comparison shopping easier, but the underlying question remains the same: does this car fit my family's life at a price I can actually afford?
For now, the data says the Tesla Model Y RWD offers the best all-around package for families willing to go electric and comfortable with a three-year-old example. The Ford Focus and Vauxhall Corsa EV are close behind for buyers who want a smaller footprint or a familiar nameplate.
Families deserve straight answers backed by numbers, not marketing slogans. If it takes a university research lab to cut through the noise, that says more about the car industry's sales pitch than it does about the buyers.