Expert answer

Hi Martina,

We're assuming you are referring to the post-2008 Focus here, so correct us if not. The 1.6-litre models are up to 10mpg more efficient and generally have much lower emissions too to help reduce your annual tax bill.

Be aware that the 1.6 TDCi engine only had issues from 2004 until about 2008. Cars/engines made after that date should be just as reliable as the 1.8-litre.

Hope that helps

Expert answer

Hi Fergal,

This engine downsizing is prevalent and not just by Ford, and it has been made possible thanks to advances in engine technology, such as high pressure fuel injection and turbocharging.

A close look at what's offered by Ford Ireland reveals that the Mondeo 1.6 TDCi is the 115hp version, where as the Focus can be had with that and a cheaper 95hp unit. The raw data reveals that the 115hp Focus does the 0-100km/h sprint in 10.9 seconds - a second faster than the Mondeo with the same engine. Likewise, the Focus is more efficient with lower emissions and fuel consumption - though the differences are not as big as you might think.

Essentially, it boils down to the engine's torque output. This engine produces 270Nm from as low as 1,750rpm, which is more than enough to deal with a car the size of the Mondeo. Naturally a 2.0-litre diesel with the same technology will be more impressive again, but the 1.6 is just fine.

For the record, we find that Ford's 1.6-litre TDCi engine has a very narrow power band, but once you learn to keep the engine within that it never feels slow. Obviously, driven like that it won't come close to its official fuel economy figures.

Hope that all helps.

Expert answer

Hi David,

The latest BMW X5 xDrive30d uses 7.4 litres of diesel every 100 kilometres on the official combined cycle. That's equivalent to 38.2mpg. As ever, few cars achieve their official figures.

For the record, emissions are 195g/km.

Hope that answers your question.

Expert answer

Hi Tommy,

First up, gearboxes: a six-speed gearbox in a given car usually means it is officially more economical than it would be if it had a five-speed gearbox, but that really will depend on the type of roads it's driven on and the driver's own style. It's not correct to say that a six-speed Renault, for example, is automatically more economical than a five-speed Ford though, as there are many more factors to consider. Best to look at the official combined consumption figures as a gauge - even though they're not usually achievable in the real world they are a good measure of one car against another.

A quick search on Carzone.ie reveals that your budget may get you into a 2009 Ford Focus 1.6 TDCi. There are plenty of different trim levels and 90- or 110hp derivatives available so take a close look at the specifications, history and mileage. Most of those are now in Band A4 with emissions of less than 120g/km and fuel consumption as low as 4.3 litres/100km (65.7mpg).

In terms of Golfs, it looks like you'd be lucky to get a 2008 version (the old one) for that same money, which means it'd have to be a 1.9- or 2.0-litre TDI engine. These cost more to tax (especially if you go pre-2008) and are a little less econonomical than the Focus above.

There don't seem to be many Renault Méganes fitting your description and budget, though a look elsewhere reveals that you may find a 2010 version at this price powered by the 1.5-litre dCi engine. This came in 86- and 110hp guises. The former is virtually as economical as the Focus and the latter only uses a little more fuel.

Finally, the Citroen C4: in terms of economy, the 2008 1.6 HDi 92hp engine is up there with the Focus etc, though there are more powerful versions available too.

In summary, if fuel economy is your priority then it's probably best to stay away from the older Golf, with its larger engine. The others are all very close and so it comes down to personal preference. We'd go for the Focus, not least because of the much wider choice of examples on the used market.

Come back to us if you need more assistance narrowing your search.

Expert answer

Hi Dermot,

Expert answer

As this Honda Civic is a pre-2008 car its motor tax is engine capacity rather than emissions based. With the 1.7-litre diesel engine the Civic will cost €544 a year to tax (up from €506 as of January 1, 2013).

We hope this helps.

Expert answer

Hi Brian,

It depends where you’re doing most of your driving. The Toyota Prius+ has CO₂ emissions of just 106g/km, and can get 60mpg if driven very, very gently, but it’ll be way too thirsty if you’re doing lots of motorway miles. The best diesel-engined MPVs are probably the 1.6 TDI VW Touran, the 1.6 HDi Citroen C3 Picasso, or the 1.5 dCi Renault Scenic.

Expert answer

Hi Eddie,

You've not told us how old the cars are that you're looking at, nor whether they are petrol or diesel, but it's pretty much the same answer in both cases. They share the same basic six-cylinder, 3.0-litre engine, but in different states of tune. The 525 has less power and torque effectively. It usually has a different emissions rating too so come back to us with more details and we'll give you the full picture.

Note: this is not the case with the current BMW 525d and 530d. The former now uses a twin-turbocharged four-cylinder 2.0-litre engine, while the 530d sticks with the 3.0-litre unit.

Hope that helps in any case

Expert answer

Hi Daniel,

Sorry to hear about the Scirocco - that 2.0 TDI version is great.

A quick browse of Carzone.ie with your budget and needs in mind brought up a few interesting options:

- Audi A3 2.0 TDI 140 - in Sport or S Line guises for maximum style - loads around
- BMW 118d M Sport - quite rare, but great to drive
- BMW 320d Coupé - you'd have to go pre-2008 with your budget, but current style at least
- Honda Civic Type S - 2.2 diesel is great and post-2008 is taxed according to emissions
- MINI Cooper D - loads around in all different colours at your budget

I've picked out the cars I reckon you'll like and I've left out things like the Volkswagen Golf and regular Ford Focus (among others).

What do you think?

Come back to us and let us know if we're on the right track.

Expert answer

Hi there,

A rate of €570 per annum would put the car in Band D based on its emissions, which is 155- to 170g/km. Our initial investigations suggest that this car should have emissions of just 134g/km, which would put it in Band B2 for an annual tax bill of €280, however, that's for a newer car than you're talking about. The older one has emissions of 165g/km, which would indeed mean a €570 tax bill.

Hope that helps clear it up