Expert answer

Hi Mike,

Well, the 1.6 Hyundai Elantra has official combined fuel economy of 38mpg, which is the equivalent of 6.1 litres per 100km. A sum of €10 buys you 7.46 litres of petrol at the average October pump price of €1.34 a litre. Assuming you reach the official fuel consumption figure that means you'll get 119km for your €10. However, you may well not reach the quoted average economy - very few people do and it's actually a pretty arbitrary number. How much less? I simply can't say - it depends on your own driving style, the condition of your car, the weather, the roads you're driving it on... Better play safe and just fill it up.

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Hi Niall,

We asked Ford Ireland about this for you. First of all, it was confirmed that your car has a timing belt, not a timing chain.

With regards to the injectors, a longer response was given:

"Mondeo DV6 has a Continental fuel system and the fuel injectors fitted on this system have correction factors on them. What this means is that they have a unique ID number that the engine's PCM need to know so it can operate them. The pump has nothing to do with how the injectors operate and its role is simply to bring the fuel up to the high pressure demanded by the system. When an injector is replaced the PCM needs to know the new number of the injector installed. This is inputted using Ford IDS Diagnostic tool. If the injector is installed and the correction factor is not learned using the Ford Diagnostic tool the vehicle will not run at optimal level and the engine may exhibit excessive noise and emissions."

Finally, with regards to a shaking steering wheel, that could be something as simple as a wheel going out of balance, so check that before you consider changing any brake items. Whether the dealer should replace warped discs after six weeks is not so clear - it really depends on the terms of your warranty.

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Hi Prince,

That’s a tricky one. In terms of your consumer rights, you are most certainly entitled to a replacement car if this one is not up to scratch and the dealership has not been able to repair it to your satisfaction.

However, you’ll need to establish that there is a specific fault or faults with the car first. I’d recommend getting it inspected by an independent motor vehicle assessor (you can find them via a quick Google search) and get them to give you a full report on it. Then you need to bring that report to the dealer and demand that either the car is fully repaired (it’s still well within its original five-year warranty after all) or give you a replacement.

Let us know how you get on

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Hi Brian,

That doesn't sound related to a timing belt problem. A timing belt can either break altogether (potentially causing very expensive engine damage), in which case the engine would not run at all, or it could slip causing the engine to, at best, run poorly all of the time.

Best bet is to bring your car to a good mechanic for a look but it could be as simple as a dirty air filter or bad fuel, neither of which would automatically cause a warning light to come on.

Let us know how you get on 

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Hi Frances,

If you mean a 320d diesel then yes, it's excellent. You should expect to get at least 45mpg in daily driving, a little more if you're careful.

If it's a petrol 318i or 320i then it'll be a little more thirsty but 35mpg on average should still be do-able.

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Hi Gerry,

It's very difficult to assess such things from afar I'm afraid. It could be any number of things. Basically it comes down to spark, fuel and air, but of course, electronics also come into it, so a sensor could be faulty as well. The best bet is to bring the car to a good local mechanic to have a look.

Hope you get it sorted soon.

Expert answer

Hi Suzanne,

I'm sorry, but it's almost impossible to assess such a thing from afar. My first impression would be a fuel supply problem, or dodgy fuel in the tank and lines, but it could be plenty of other things.

I'd urge you bring the car to a good local mechanic as soon as you can to take a look at it before any damage is done.

Hope it doesn't work out too expensive to fix

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Hi Keith,

Both are excellent cars and the 175hp X-Trail's extra grunt could be very useful when hauling trees and trailers. That said, the Honda is still plenty grunty and a bit more plush inside than the Nissan. Actually this is a hard one to choose - I know from personal experience that the Honda is close to indestructible, but I also happen to think that the X-Trail is a really underrated car.

Coin toss so - go for the Honda.

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Hi Tom,

There's no doubt that the 1.6-litre petrol engine would fit in the Laguna's engine bay, but it could be a world of pain getting everything to work, from the fuel system to the electronics and sensors. We wouldn't recommend such a project.

Expert answer

Hi Thomas,

Yes, in fact they're much better because they're smoother (thanks to direct fuel injection instead of the old Pump Düse system) and have much more sophisticated electronics to monitor their health. They don't seem to suffer from the old air mass sensor issues that plagued the 1.9 either. It's also a much more economical engine - figure on getting high-fifties mpg, rather than the high-forties of the old engine.