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Hi John,

Yes, but with one small caveat. The Prius has always been one of Toyota's best, and indeed best-built cars. It's essentially a flagship model, particularly for Toyota's eco-friendly ambitions. There have been a few recalls (for malfunctioning brake lights, airbags, steering and brake issues, as well as the infamous sticky-throttle-pedal one), but generally Prius are solidly reliable and there have thus far been no reports of fading or failing battery performance. We've heard one or two reports of rust breaking out, but they're probably most likely down to unattended panel damage exposing bare metal.

The caveat? It depends how and where you drive as to whether or not it's worth buying a Prius. Yes, you'll get cheap road tax, but to get even vaguely close to Toyota's quoted 65mpg fuel economy figures, you're going to have to drive with the reticence of a trappist monk. Get anywhere in the neighbourhood of enthusiastic driving and you're going to see the fuel economy plummet, ditto for undertaking any long motorway journeys. But, if you spend most of your time in town, where the Prius' electric motor and stop-start systems can best bring their armament to bear, then the economy should pick up, and you'll have one of the most comfortable, reliable and relaxing cars in which to hustle your way through city traffic.

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Hi Patsy,

BMW offers three different diesel engines with xDrive four-wheel drive in the X3, the xDrive20d, xDrive30d and xDrive35d. The xDrive20d can be had with a manual or automatic gearbox and the official figure is 50.4mpg (5.6 litres/100km) no matter which transmission is fitted. The xDrive30d and xDrive35d are only available with automatic gearboxes and the official fuel economy figures are 47.1mpg and 46.3mpg respectively (6.0- and 6.1 litres/100km).

Those figures won't be obtainable in the real-world, obviously! We spent time with the xDrive20d during snowy conditions a few years back (read the full review here) and averaged 34mpg (8.3 litres/100km), though in normal conditions it should do a lot better than that. We also tested the xDrive30d (read that full review here), though apologies, but I didn't record the average fuel consumption figure at the time...

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Hi Frank,

The new-shape BMW 5 Series is a fabulous car, especially if it has the right equipment, such as a leather interior, etc. The 520d is nothing short of fantastic when new, though we've heard reports that this 2.0-litre turbodiesel engine can have expensive problems as it gets older - especially if oil maintenance is not adhered to strictly. If the one you're looking at has a detailed service history then there's less worry.

However, if you do very small mileage we'd question why you're going for a diesel car at all. The fuel economy might be tempting, but you should look around and see what petrol models you can get for your money too, as modern petrol engines are improving in terms of fuel economy and emissions - and they're generally cheaper to buy and maintain. They're also quieter and far better suited to low mileage use.

Let us know how you get on

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Hi Aleksandrs,

The most common fault with the RX 400h, as with any hybrid, is that the fuel economy won't be half as good as you think it will. The last RX model we tested returned just 29mpg overall, a figure we've equalled in both a Land Rover Discovery 3.0 diesel and a Porsche 911 Carrera 4S!

That apart, they're incredibly solidly built, as are pretty much all Lexus models. The high-tech in-car entertainment system, with its touch-screen controller, can throw up an occasional glitch but the only other serious concern lies in the hybrid electric drivetrain. Generally, it's totally reliable but we have heard of an occasional one having an AC/DC power convertor fail, which is a massively expensive job to fix if it does go wrong. As we say, it seems to be an isolated problem but one worth bearing in mind.

Let us know how you get on

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Hi Keith,

No, it's not a waste of time at all. It's almost always better value to keep and fix an existing car rather than pay the cost-of-change to upgrade to something newer. That said, if you're convinced you need a better solution, then you won't do better than to go for one of the many car-vans on offer now. The Renault Kangoo and Citroen Berlingo are the best known versions, but there are also similar models available from Fiat, Volkswagen and Peugeot.  My personal pick would be the Fiat Doblo, fitted with the 1.6- or 1.3-litre MultiJet diesel engines. You'll find the cabin surprisingly comfy, it's quite pleasant to drive, very economical and good on tax and massively spacious in the back. There's even a seven-seat version available if you want to be really popular at the school gate.

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Hi Eoin,

OK, first off you're not mad and an M Sport spec BMW 318d or 320d is just about as perfect a car as you'll find. Mind you, test drive carefully before you buy as the M Sport suspension can be pretty stiff and unforgiving on certain roads, and the steering, while more incisive than what you'd get in the Golf, can also be a bit heavy and fake-feeling.

That said, there are things you can do to make your Golf drive with a little more sharpness and the first place I'd start is with the tyres. Most, if not all, cars these days come with high-efficiency low rolling resistance tyres that are there to maximise fuel economy, but don't do much for steering feel or handling prowess. So why not swap the boots for something a little more aggressive? A set of Pirelli P-Zeros or Michelin Pilot tyres might just make all the difference, so it's worth a try if nothing else.

You could also look at modifying the suspension to dial out that understeer, but we'd recommend you seek professional mechanical advice before going down that road.

Let us know what you do in any case.

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Hi James,

Actually, you mentioned the Ford C-Max there and, while we criticised it when new for not being exciting enough, it's a pretty canny secondhand buy, with good build quality and excellent economy as long as you go for the 1.6 TDCi diesel.

If it's a full-size seven-seater you want then your €8k budget will easily get you into a SEAT Alhambra seven-seater. It's the old shape model, so you won't get fold-flat rear seats, but the 1.9-litre TDI diesel engine is both frugal and largely unburstable.

Finally there's the good old Opel Zafira. Ever popular, it's not the most refined or sophisticated but the 1.9 CDTi diesel engine is frugal and the interior is hugely flexible and adaptable.

Let us know how you get on

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Hi Catherine,

A rough estimate of your C4's value should give you a budget of around €12,000 (and you might even do a bit better than that if you're lucky). Even at that level though, there is a plethora of cars matching your description out there. How about we start with something really classy? A BMW 316i maybe? Plenty out there, all priced around €11k and the 1.6-litre engine means reasonable tax and fuel economy even though it's a petrol engine.

Or you might need something a bit more spacious and economical. So we found a Citroen C5 Tourer estate with the 1.6-litre HDi diesel engine. It's a 2008 model so you'll be on the new CO₂-based tax system, it's massive inside and very comfy. Well built too.

Finally, you might fancy something a bit more compact and cheaper to run, and that budget opens up a world of Ford Focus saloons and estates with either the 1.6-litre petrol or 1.8 diesel engines. Simple, spacious, reliable and plentiful, you won't go wrong with that one.

WHat do you think?

Expert answer

Hi Lisa,

Well, there is the obvious recommendation of a Ford Focus 1.6 TDCi, but a €7,000 budget won't, sadly, get you into a post-2008 car, so you'll be paying a higher rate of annual motor tax. 

So here's a less obvious recommendation: an Opel Astra 1.3 CDTi. It's not the fastest car in the world, but it should prove very economical, it's well built, comfy, spacious and even has a decent boot. Best of all 130g/km emissions mean you'll pay a reasonable €270 a year to tax it.

What do you think?

Expert answer

Hi Sean,

According to the official figures, the comparison in terms of combined fuel economy is this: the 520i gets 28.8mpg, the 525d gets 36.2mpg and the Lexus IS 250 gets 31.0mpg. A clear win for the diesel 5 Series there, but it's worth remembering that these figures are taken from laboratory samples and you may have to knock off as much as 25% to get the real-world driving figure.

Hope that helps