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Hi Helena,

I presume you mean the diesel versions of both cars? If so, according to the official figures, a Qashqai 1.5 dCi diesel will return 54.3mpg on average, while a Corolla Verso 2.2 D-4D will return 44.8mpg.

Hope that helps

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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 Greg,

Yup, they're a good 'un. Ford's reliability record has been steadily improving over the past few years and there are no major reported issues for that generation of Focus. Just watch that a recall to fix a leaking fuel return pipe has been completed and, of course, make sure the car has a full service history. Oh, and as many of these cars will have begun life as company cars, that can mean that they've been well cared for and serviced regularly, but it can also mean that they've been abused by uncaring owners. Check carefully.

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Hi Emer,

Both are excellent in terms of reliability (they are after all a Mazda and a Toyota), but it's the Mazda that will be more fuel efficient. Simple physics really; while there's not much difference in the overall weight, the RAV4, being an SUV, is taller and therefore less aerodynamic. Unless you need (and I mean REALLY need) the RAV's extra ground clearance and rough road abilities, then a Mazda6 (especially the estate one) should prove a reliable, spacious and enjoyable ownership prospect. 

Let us know which way you go

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Hi Alanna,

I reckon the Qashqai +2 might be the best one to go for. The extra seats are pretty small but the boot on the +2 is simply massive when they're folded flat, so that's helpful when you're lugging around two small ones and their various chattels. Don't worry about running costs too much - the Qashqai looks like an SUV but it's really a hatchback with attitude and the 1.5 diesel engine is reliable, economical and has reasonably low emissions too.

That Toyota 1.4 diesel you mentioned would indeed be much less powerful than your Mazda's engine - it's about 20hp down and noticeably so. Volkswagen Jettas are indeed reliable, but I reckon that the Nissan would be slightly more so, so make that your first choice.

Let us know how you get on

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Hi Tanya,

Actually, both cars have exactly the same engine - BMW's long-serving 3.0-litre straight-six diesel. The first generation X5 is little short of excellent, with terrific handling and a gorgeous, comfortable cabin. Reliability isn't the best though. The engines have occasional problems with fuel injectors and developing cracks in the inlet manifold, while steering and suspension are also prone to damage and wear. X5s are also notorious for chewing through tyres at a ferocious rate. The engine's air mass sensor can also fail, leading to poor acceleration although you'll spot that easily enough on a test drive.

Basically, it's worth getting any potential purchase checked over by the AA for any faults, and just ignore anything that doesn't come with a full service history. Oh, and it's better to go for the 2004 one - that should have the newer six-speed automatic gearbox (ignore manuals - they'll be worth much less come trade-in time) that improves fuel economy to just over 30mpg.

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Hi Tanya,

OK, prices for a 2007 Kia Sorento range from as little as €6,000 for a commercial model to as much as €15,000, which seems a bit hopeful to me. Let's play reasonably safe and suggest that you should get about €9,000 to €10,000 on trade-in. 

Now, the 5 Series. The E60 5 Series that ran from 2002 to 2010 is one of our all time favourite cars and the 535d is one of the very best. Powerful, smooth, reasonably economical and able to spin the rear wheels in third gear. Ahem.

It's worth considering other models though. The 535d is a twin-turbo version of the same 3.0-litre six-cylinder engine that you'll find, in single turbo form, in the 530d. You won't save any money in terms of tax (it's the same capacity), but the 530d will be better on fuel and cheaper to insure. If you really want to save some money, look for the ever-popular 520d, which is almost ridiculously cheap to run and far more powerful than you might expect. 

As for things to look for, the suspension is the 5's weak point so if there are any nasty clonking noises or if the car feels unstable on the road, or the steering feels inaccurate, walk away. The iDrive infotainment system has also been known to give bother so check and make sure that it is working and, as with any prestige car, make sure it has a full service history.

With a car like this, I'd never advise buying privately or from an unfranchised dealer. SIMI membership should be at least the bottom line and you'll get a better deal from a BMW main dealer than you might expect, especially if the car is part of their approved used programme. 

A 2005 530d or 535d seems to hover around a similar asking price to your Kia so you'll just have to negotiate carefully to get the best price.

Let us know how you get on.

Expert answer

Hi there,

I’d be slightly careful. Remapping can unleash more power and torque, but you need to be very careful that the chip comes from a reputable source and that it won’t unduly affect the reliability and fuel consumption of the engine. I’d have a word with the guys at the Volkswagen and Audi owners club of Ireland, VAGE, as they tend to know their onions and would be able to give you more precise advice.

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Hi Hento,

Not much in the difference, actually. Fuel consumption and CO₂ figures are broadly comparable and on the road you'll hardly notice the difference. The 1.4 has a little more grunt in depth for motorway work, but for the rest of the time I'd be perfectly happy with the 1.2.

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Hi Michael,

Well, it kind of depends on the car. If you mean something along the lines of a Hyundai i10 or even a Peugeot 208 (ok, so that one's a 1.2 but still...) then the answer is not much. Fuel economy should work out at around 50mpg depending on how you drive; emissions should be under 120g/km; and insurance should be dirt cheap.

If you're talking about an older model, the waters are a bit muddier. Smaller engines generally mean lower running costs but there are cars out there with underpowered smaller engines, and you have to spend so much time ragging them to keep up with the flow of traffic that your fuel consumption goes through the roof.