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Hi Rory,

Both cars use dual clutch semi-automatic gearboxes, which are pretty slick-shifting, but Volkswagen's DSG transmission just edges it for smoothness and quickness. 

On the emissions front it's rather bad news I'm afraid. If you're buying 2008 model year cars then you're looking at emissions of 189g/km for the Mondeo 2.0 TDCi Powershift and 175g/km for the Passat 2.0 TDI DSG. That means tax of €750 a year.

It gets a bit better if you can spool forward to 2010 when the Passat's emissions drop to 158g/km so that means a tax bill of €570 a year. 

Just for reference, the Mondeo 2.0 diesel auto gets an official 39mpg while the 2010 Passat with DSG gets 47mpg.

To be honest, if you can live without an automatic gearbox you would be better to go for the 1.6-litre diesel versions of either car. Both have decent performance and much better economy and emissions. For instance, a 1.6 BlueMotion Technologies Passat gets 62mpg and has emissions of just 118g/km so tax of €200 a year.

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Hi Marion,

Depends on what you need it for really. If you're doing low mileage or just duffing around town most of the time, then the 1.2 petrol is sweet, more refined and probably a bit cheaper to buy. If on the other hand you do big miles or spend lots of time on the motorway, then the diesel is the one to have with genuine 60mpg potential.

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Hi Ladi,

I believe it's on the gearbox side of the engine below the starting motor. It's really awkward to get to and we would recommend that it is removed only by a professional mechanic.

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Hi John,

I'm going to be predictable and say you should get a Volkswagen Golf. A budget of €3k would definitely get you a MkIV 1.9 TDI model and you may even just scrape into a MkV, which would be even better again. Just track down one that's been looked after and serviced regularly and you should be fine.

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Hi Rao,

At a rough guess that should give you a budget of between €10,000 and €12,000, which is healthy enough. If you've been a Toyota owner in the past I'm assuming you want to stick with something that'll be reliable so my first suggestion is an Auris hatchback. They're spacious inside, so pass the two kids test with ease and the 1.33-litre petrol version should be economical enough for your commuting style. 

Also consider a Honda Civic. If anything, Hondas tend to be even better built than Toyotas and while the Civic's avant-garde styling may be a bit of an acquired taste, its spacious and practical cabin is a boon for family life. A 2.2-litre diesel may sound like overkill but it's a terrific engine and has low emissions and therefore is cheap to tax. 

Finally, if you want something with a bit more space, how about a Kia cee'd SW estate? Reliably solid, and with that seven-year warranty, pleasant to drive and the estate version has a massive boot.

Let us know how you get on

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Hi Brian,

First up, 143,000 miles isn't much for the 1.8 TDCi engine so don't focus on that. This sounds like the car has gone into 'limp home' mode, which could be for a variety of reasons from a faulty sensor to a blocked diesel particulate filter (DPF). You really need the car hooked up to a diagnostic computer at a garage to get to the bottom of the problem quickly.

Let us know how you get on.

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Hi Pat,

If you're doing low mileage then you are way better off sticking with petrol. Even taking the higher tax into account, you'll still never make back the higher purchase price in fuel savings and with low mileage you're almost certainly going to run into diesel particulate filter issues. 

The good news is that the 1.6 Avensis is pretty economical for a small petrol engine in a big car. Drive it gently and you should regularly see the sunny side of 40mpg.

Hope that helps

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Hi Helena,

I presume you mean the diesel versions of both cars? If so, according to the official figures, a Qashqai 1.5 dCi diesel will return 54.3mpg on average, while a Corolla Verso 2.2 D-4D will return 44.8mpg.

Hope that helps

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Hi James,

There would be quite a significant difference in consumption. According to the official figures, your car should be getting a 49mpg average economy figure, while a 2011 Octavia 1.6 TDI would get 62mpg. That's the kind of difference that would really add up over the course of 45,000km. Mind you, you're talking about the difference between a 1.6 with 105hp and a 2.0-litre with 170hp and huge torque, so expect to have to adjust your driving style accordingly. As a potential half-way house, the new 180hp Octavia RS TDI should manage 55mpg…

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Hi Tom,

Very few, thankfully. Watch for damp carpets as the ventilation system filters have a habit of leaking and letting water into the cabin, and check too to make sure that all of the pipes and plumbing on the diesel engine are correct - there were some problems with them in that regard. There's also a recurring issue with the airbag warning light that seems to be more related to the light than the actual airbag, but it's irritating nonetheless. 

The CO₂ emissions for the 1.4 TDCi Fusion are 120g/km so it'll cost you €200 a year to tax.