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Hi Diarmuid,

On the site we have a full test of the XF Sportbrake estate here, powered by the diesel engine. I never added in the average economy figure as my driving that week was mostly in an urban setting. For the record, it used about 9.0 litres/100km (31.4mpg). It should do a lot better on the motorway.

Is that of help?

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Hi Barbara,

Yes, it’s due to arrive in 2019 (and will probably be shown off at next year’s Geneva Motor Show in February) and will be based on the same TNGA chassis as you’ll currently find under the Toyota Prius and CH-R. It will definitely use the same new 1.5-litre petrol engine as installed in the updated Yaris, and will also get the 1.6-litre diesel bought-in from BMW and already being used in the Avensis and Verso. There is likely to be a hybrid version too, but that’s not guaranteed as yet.

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Hi Philip,

The thing with Italian cars is that they're like the apocryphal little sister. When they're good, they're very, very good. When they're bad, they're 'orrible.

The Multipla is actually one of the more robust Fiats, and speaking from personal experience the 1.9 JTDM diesel engine seems to take all manner of abuse and high mileage in its stride.

The best bet seems to be to avoid the 1.6 petrol model, and check to see if a diesel is down on power or displaying obvious flat-spots in the power delivery. If so, it could be an exhaust gas recirculation valve, or a more serious crankshaft wear issue. 

Other than that, check and make sure that everything electronic is working right. Fiat has come a long way on reliability since the bad old days but irritating electrical gremlins remain the brand's Achilles heel.

Let us know how you get on

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Hi John,

With that kind of mileage, I think you should go for the petrol Avensis. Yes, it’ll be a little higher in tax costs, but you’ll get it for less than the diesel, and have lower maintenance costs. 

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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 Patrick,

I've always had a bit of a soft-spot for the current C5. No, it's not as sharp to drive as a Mondeo or Passat, but it's a lovely, comfy car with tremendous long-haul refinement. Pick of the bunch is the 1.6 HDi diesel model and you should get an easy 50mpg out of it.

As for faults, check for a chuffing sound from the engine when it's running, as that could indicate that the fuel injectors are in need of replacing. Make sure it's had a cambelt change and watch for diesel particulate filter warning lights, which indicate that it needs a good long run at high engine speed to burn the collected diesel soot out of the filter. Suspension problems are quite common - usually worn ball-joints or bushes. Other than that, they're pretty solid.

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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 Jim,

Very reliable I hope, as I've just bought a 2006 version! It's essentially unchanged since then and before I bought I did a good deal of research. The most important thing to watch is the oil. It needs to be the correct grade and I'd recommend changing it more often than the manufacturer recommends. At the rear of the engine there's a small timing chain linking the camshafts and it is known to break. This is thought to be down to poor oil maintenance.

Other than that, it seems to be a robust choice.

Let me know how you get on.

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Hi Celsus,

As an overview, Skoda's cars are all reliable, quite comfortable and generally economical. Bigger wheels reduce comfort and the Yeti is less 'soft' on the road than say the Octavia and Superb. Most people stick with the diesel engines, which are very efficient.

If you'd like us to comment on something specific please come back to us.

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Hi Martina,

It's been a while since we drove the Volkswagen Golf Plus in truth, and bear in mind that the one that's on sale right now is based on the previous generation Golf. However, while it's usefully more spacious than the Golf itself, it's not the most practical or versatile car for the money. Nonetheless, it does everything well and that 1.6-litre TDI diesel engine is great. It's relatively quiet and refined, while having plenty of performance. It also is cheap to tax and fuel.

Let us know if you'd like alternative suggestions for your money.