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Hi Susan,

Well, strictly speaking the Santa Fe isn't an MPV, it's an SUV (I know; Captain Pedant strikes again...) and that does have a pretty unpleasant effect on its CO₂ rating. A 2008 2.2 CRDi diesel Santa Fe emits 190g/km of CO₂ - enough to land you with a €750 annual bill. That aside it's a very fine car, with reliability, looks and practicality all on its side.

If it's lower CO₂ you're looking for though, you may well have to consider an MPV. The Ford C-Max is only capable of taking three child seats once you get into the current model, and that may still be too pricey for you. Likewise, the Mazda5 needs to be a recent model if it's to have the current 1.6 diesel that brings with it lower tax bills. So, try and track down a 2009 Citroen C4 Picasso with the 1.6 HDi diesel and the EGS automatic gearbox. That has a 140g/km CO₂ emissions figure, so you'll just scrape into the top end of Band B with a €280 tax bill.

How does that sound?

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Hi Caroline,

That's pretty much the only one, to be honest. At least so far. The front-wheel drive version of the RX 450h has CO₂ emissions of 140g/km, which means you'll pay just €280 a year to tax it. Not bad for a car like that. The problem is that you'll never get the kind of fuel economy that Lexus quotes for it. Around 30mpg will probably be the best you'll achieve. 

Later this month though, Honda will launch a 1.6-litre diesel version of its CR-V. It's not quite as big as the Lexus but is really very spacious and has a massive boot. With Band A4 emissions (€200 a year) of 119g/km, a smooth chassis and impeccable build quality, it could be your best bet.

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Hi Ian,

There are really only two options when it comes to S-Max engines and those are the 125hp 1.8 TDCi diesel and the 2.0-litre TDCi diesel in 140hp form. There was a 163hp version as well, but they're pretty thin on the ground and forget about the rarer than hen's molars 2.5-litre 212hp petrol version with the engine from the Focus ST; it was fantastic fun but nobody bought one as far as we can tell.

Now, originally both the 1.8- and 2.0-litre engines shared the same 164g/km CO₂ rating, which makes road tax a bit on the pricey side (€570 a year), but in 2010, Ford facelifted the S-Max, dropped the 1.8 TDCi and introduced an updated 2.0 diesel with emissions of 143g/km, making for a much more palatable €390 a year tax bill. So, that's the one we'd advise you go for and as long as you get either a Zetec or Titanium spec version, you'll get a reasonable amount of toys to keep you happy in the cabin.

Cracking car, the S-Max actually. Spacious but terrific to drive. Let us know how you get on.

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Hi Myles,

With that length of a daily commute, I'd reckon that you should definitely go for diesel and back in 2008 there was actually a choice of Focus diesels, with the run-out 1.8 TDCi and the incoming 1.6 TDCi both available. Both are excellent choices, with the 1.8 possibly having an edge on overall reliability (it's an older and more proven design) but the 1.6 having the edge in terms of fuel economy and emissions. Find a well-cared for example with full service history (those diesel injection systems are complex and need looking after) and you won't go wrong.

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Hi Deirdre,

Well, if you're not actually pulling anything, you shouldn't really need actual four-wheel drive, so I suggest either a Skoda Yeti Greenline or, if you fancy something a little larger, a Mazda CX-5 150hp Sport. Both have CO₂ emissions of 119g/km so cost just the €200 a year to tax. By comparison, a MINI Cooper diesel costs €190. 

If you really need the four-wheel drive, there are all-wheel drive versions of both cars but you're into higher purchase prices and tax bands in both cases.

Come back to us if you'd like more help

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Hi Declan,

Well, obviously the 2.0-litre is more powerful, and with 150hp compared to the Golf 1.6 TDI’s 120hp, quite a bit more so. Lots more torque too, which makes driving much more effortless. There’s not a huge penalty in terms of fuel economy or emissions either, so you’re not going to have to shell out masses of extra cash in terms of running costs, and the 2.0-litre is more refined and smoother than the 1.6.

Is there any point to buying the 1.6 then? Yes — it’ll be cheaper to insure, and easier to sell on as most private buyers will shun the bigger engine.

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Hi Cormac,

It will depend on the year and model you’re talking about, but if you mean the 2008 Audi A6 update, which was the first model with the TDIe engine, then it’s basically lightly tweaked for economy and emissions, but those will be nothing to write home about compared to more modern cars. The TDIe could manage 53mpg and 139g/km, but that was with the 140hp engine, so it’s a touch under-powered in the A6. You could be better off going for a more powerful 170hp version, which will have slightly higher emissions, but which will probably do better in economy terms in real-world driving - and far more satisfying to drive.

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Hi Patrick,

At that kind of mileage, you really should be going for a petrol. A 320i has plenty of poke, is very refined and nice to drive, and has decent fuel economy and emissions. 

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Hi James,

I’m tempted to say yes, simply because the car is going to be worth very little if you go to sell it or trade it in without that work being done. True, the cost of repair in this case is probably about what the car is worth, but if you still love it (and it sounds as if you do) then I think it’s worth having a go at maintaining it.

True, there’s always the danger of more trouble down the line and it’s impossible for us to quantify how likely that is, but put it this way — the €1,200 you’ll spend on it now will be a fraction of the cost of chopping it in for something new, so if there are bigger problems in a year’s time, you won’t have cost yourself too much. 

Expert answer

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