Expert answer

Hi Rory,

First of all, there are a huge number of factors that affect your fuel consumption. Tyre pressures is a major one - ensure they're in spec. Next up is your use of the air conditioning and other energy-sapping devices like rear window demister. The weight you carry in the car and whether you have a roof box or roof bars fitted will also have an effect. Last, but certainly not least, is your driving style.

You've not told us which engine you have so we'll assume it's the 1.5 dCi 105hp, as that's one of the most common in Ireland. The official urban figure for that car was 6.4 litres/100km (44.1mpg) and the combined consumption figure is 5.4 litres/100km (52.3mpg).

Hope that's of some help

Expert answer

Hi Catherine,

That's an interesting one and the decision will probably come down to your personal preference. The Discovery certainly has a higher 'status' and it is a very good car, but a newer, highly specified Galaxy might be the logical choice. Both cars are relatively reliable and highly comfortable. The Galaxy has more space and probably more equipment, but that depends on the Discovery you're looking at.

One thing to be aware of is that the Discovery is likely to have higher running costs, from fuel, tyres, servicing and insurance to annual road tax.

Bear all that in mind and then take the Discovery for a good long test drive before you decide - and don't be tempted by 'too good to be true' prices either. Get a Cartell.ie history check to make sure there's nothing dodgy about the car you're considering.

Let us know how you get on.

Expert answer

Hi Shane,

If this is the exhaust noise we think it is then this is quite normal in the sportier MINIs - it was engineered in! The spark timing is retarded intentionally to allow a small amount of unburned fuel into the exhaust, where it then combusts giving a distinctive sound on the overrun. Many think it sounds sporty.

If it happens at other times then you may have a problem. Best to get it listened to by an expert.

Hope that helps

Expert answer

Hi Christopher,

First things first: go for automatic. The fuel economy won't be as good, but there are far more on the market and the manual version retains the foot-operated parking brake, which is madness. It should return about 35mpg.

In general it's a reliable car, though check all electrics and if the gearbox is jerky walk away. Also listen out for suspension knocks. Insist on a full service history or find a car that has it.

Hope that all helps.

Expert answer

Hi Martin,

For the size of car and its capability off-road the ML 270 CDI has acceptable economy, but you'll get a shock if you're moving over from a regular car, as it's thirsty by that measure. The early versions do not have a great reputation for reliability so make sure you get any car you're interested in checked out thoroughly - and insist on a full service history.

Hope that's of some help

Expert answer

Hi Enda,

Despite the premium image, the Lexus IS isn't all that bad. Servicing rates are generally cheaper than other premium brands, which helps offset more regular service intervals. It's also a highly reliable model, so you should only be paying for routine maintenance. It's not too bad on fuel either considering.

Hope that helps

Expert answer

Hi Simon,

That is a lovely car, but you need to be prepared for the high running costs. Annual road tax alone is €1,683, while it's also heavy on fuel. No doubt it has low profile tyres as well, which are expensive to replace.

It seems to have very low mileage for the year, so make sure you get that verified. If it's right then it's still fairly fresh, but this generation of the 3 Series is expensive to maintain once the miles rack up.

Go into the deal with your eyes open and it could still be a great car for you.

Expert answer

Hi Eamon,

To us that seems like an unfair comparison given the price gap between the two, as the newer car will be far fresher in every way - but so it should be at that price. We'd be slow to recommend the older diesel Clio purely because of the mileage it has accrued already - and you plan on doing above average annual mileage on top of that. It would definitely start costing you money and, worse, could be out of action while being repaired - which would be a massive inconvenience.

In pure overall cost terms it might win out (taking into consideration the purchase price as well), but even so our advice would be to go with the petrol model - or look at alternative diesel options. There's a lot of choice out there.

Let us know if you want help finding something suitable.

Expert answer

Hi Lisa,

You're better placed than us to answer that question, as it really depend on your driving style, the road conditions, how heavy traffic is, the type of road and how full the car is.

Saying all that, the official combined consumption figure for that car is 3.7 litres/100km (76.3mpg) and it has a 53-litre fuel tank. So that means 358 kilometres. The 'combined' figures can be a little misleading though, as they don't relate to the real world.

We'd estimate 250 kilometres on average for that car.

Hope that's of some help.

Expert answer

Hi Teresa,

We spoke to Volkswagen and I'm afraid there's no permanent way to switch this off that it recommends. You'll just have to do it manually each time you start up if it bothers you.

From our perspective, this feature is becoming more and more common and we think it's a great idea. If all cars on the road used it think how much fuel could be saved in town. Likewise - and in contrast to what you've said - noise pollution would be reduced overall thanks to the lack of engine idling noise at traffic lights.

Don't worry about the starting motor wearing out either, as most cars with stop-start have heavier duty starters, along with systems to monitor their condition and prevent it being over used.