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Hi Nicky,

OK, I think you have a couple of options here. First off, assuming you have a friendly, trustworthy mechanic who looks after your Yaris, it's worth having a word with them to find out how much life they realistically think is left in it and how much money you'll need to spend to keep it going. If the omens are good in that respect, then there's nothing wrong in the slightest with sticking with what you know and keeping your current, faithful steed.

If it's a poorer prognosis then I'd suggest sticking with what you know and simply upgrade to a newer Yaris. The model that's just been replaced was a fine car, sturdy as ever and really quite nice to drive. You won't go wrong. As an alternative, have a look at a Honda Jazz. They are usually a little more expensive than an equivalent Yaris but are more spacious inside and a little more technically advanced, so well worth a look.

Let us know how you get on

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Hi Claire,

Generally speaking the reliability record of the Fabia is pretty impressive and you shouldn't suffer any major problems. There are reports of the occasional 'nightmare' car where just everything seems to go wrong, but they appear to be few and far between. In terms of fuel economy, beware the 1.2. It's a very underpowered engine, and you have to thrash it hard to keep up with the flow of traffic, especially on the motorway, so it might be worth shopping around for a 1.4 depending on what kind of driving you'll be doing with it.

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Hi Jacinta,

Essentially the old 1.9 TDI Pump Düse engine is just a bit less sophisticated than the newer, cleaner 1.6 TDI common rail engine. That said it's still pretty economical and while you could potentially get 60mpg from the 1.6 you should pretty easily get low-fifties-mpg from the 1.9.

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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 Paddy,

Normally we'd say the Honda every time, but while the Jazz is beautifully built and exceptionally spacious and practical, there's no getting around the fact that the Fiesta is hugely more enjoyable to drive. It kinda depends on your needs. If you're of a practical bent go for the Honda. If driving fun is high on your list of priorities, go for the Fiesta.

Let us know which way you go

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Hi Patrick,

Yup, it's entirely achievable. I'd say with lots of long motorway miles (and what an ideal car for that task the A5 is) you should easily be able to crack 50mpg, and 55mpg should be possible. Of course, much depends on your driving style - lots of hard acceleration, or excess weight in the car, will hamper your economical efforts.

Let us know how you get on

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Hi Rowland,

OK, there are a lot of parameters to go with here, but the basics are that you need a car that's cheap to buy (so it can't, sadly be too new), has affordable running costs and won't break down every time it rains. I reckon that gives you a choice of three or four key models: Honda Civic, Toyota Corolla or Auris, Kia cee'd or Hyundai i30.

Have a shop around and you should be able to find several of those all well within your purchase price range, while they all have efficient engines and excellent reliability records. In the case of the Kia and the Hyundai, they also have lengthy warranties, which, even if there's none left on the one you buy, at least means that they're more likely to have been looked after. My personal choice would be the Honda. Track down a nice 1.4 petrol Civic and I don't think you'll look back.

Let us know how you get on

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Hi Gary,

Very, very hard to go wrong with a Golf for your starter car. Cheap to buy and maintain, but if you get a nice one, clean it and care for it, it'll look every bit as classy and desirable as a brand new one. The 1.4 has all the performance of a slow moving glacier, but that's probably why the insurance is so cheap. It's also worth having a look for a nice 1.4-litre MINI One, if only for the sheer fun of the thing, or if you wanted to be really, really sensible (and shave even more off the insurance) you could track down a 1.0-litre Toyota Yaris.

Let us know how you get on

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Hi William,

The new Lexus NX will be unveiled in public for the first time next month (April) at the Beijing motor show in China. It is possible that we'll get a static preview of the car ourselves in May in London before driving it in September for review. The NX goes on sale in Ireland in October.

Let us know if we can help with anything else

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Hi Michael,

The official average economy for a 2005 1.9 TDI 105hp Golf is 53mpg, and assuming the engine has been reasonably well cared for down the years, I'd say you wouldn't have too much trouble matching that figure in day-to-day driving. As for switching to 1.4 petrol, it kind of depends on your driving style and habits. If you're doing lots of long journeys, especially ones with lots of motorway mileage, then diesel is a no-brainer. If your driving is mostly done at low speed, around town, for short hops then it might well be worth sticking with petrol. Basically, you need to get your pen and paper out and work out what mileage you do, and then compare the prices you're seeing for both the petrol and diesel versions of the cars you want. If the saving on the fuel isn't more than extra price of buying the diesel car, then it's worth considering sticking with petrol.

Let us know how you get on