Expert answer

Hi Tom,

The Citroen will be cheaper to run (it has a 1.6 diesel engine compared to the S-Max's 2.0-litre unit), but if you can afford the slightly higher tax and fuel bills, I'd go for the Ford. It's better built, more spacious and much nicer to drive.

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Hi Peter,

A brilliant car, albeit one with a couple of shortcomings relative to its German rivals. It's probably the best-looking car in the class, and the 500-litre boot is a match for the BMW 5 Series Touring and Audi A6 Avant (though much smaller than that of the Mercedes-Benz E-Class). It's utterly delightful to drive too, better even than the much-praised BMW, with brilliant steering and a comfy ride.

On the downside, the interior is a step behind the Germans (not enough space, old-fashioned touch-screen infotainment system, narrow front seats) and the fuel tank is on the small side, limiting your touring range and making the car feel thirstier than it actually is. The 2.2-litre diesel engine in 190hp form is the best all-round to go for, but the lower power 163hp is a bit cheaper to buy and you'll hardly ever notice the difference in day-to-day driving. Or, you could get the best version; the 272hp 3.0 D V6 diesel – a properly quick, practical car that.

Here's our road test of the XF Sportbrake

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Hi Patrick,

I really like the S80 - a lovely big comfy thing, ideal if you're doing lots of long journeys and that 1.6 diesel engine is super efficient; you could get up to 1,500km from a tank of fuel. 

Reliability shouldn't be a major issue once you make sure that the car has a full service history. Like any executive saloon there's a lot of electronic toys in there and if it's been well cared for, there's less chance of them going wrong. Keep an eye on the service schedule to make sure that the engine has always been topped up with the highest grade of oil and if it feels down on power or sluggish when accelerating, it's most likely the exhaust gas recirculation (EGR) valve.

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Hi Tony,

New or old? Frankly, they're all good. The current car is slick, massively spacious, lovely to drive and, aside from occasionally poor fuel economy, terrific ownership prospects. 

The previous generation is all of that with slightly less slick styling inside and out. Make sure you go for the later, post-facelift model that uses Mazda's own 129- or 180hp 2.2 diesel engine.

Finally the original - made from 2002 - it's a landmark car. Reliable, fabulous to drive and quietly handsome. They're super-cheap now and a perfect low-budget purchase.

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Hi Michael,

If it's short trips and city driving then you're probably better off with the petrol model. It's significantly cheaper than the diesel version, which gives you plenty of budget to buy fuel and pay the slightly more expensive road tax. One word of warning though - from personal experience it can be almost impossible to move on a Mk1 petrol Qashqai when the market is so diesel-obsessed. Several people I know have had to take a bath on second hand value when it came to trading in a first gen 1.6 petrol Qashqai so you need to be aware of that. The new 1.2 petrol turbo version should by rights fare better because it's so efficient but with the market still being diesel mad, you need to be careful.

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Hi Noel,

All things being equal, it'll be the Merc that'll do better. I'm comparing the 2011 model years for both as I'm assuming you mean the previous generation of Mercedes-Benz ML-Class. 

According to the official figures, the ML 280 CDI automatic gets 30.1mpg on the combined cycle, while the Mitsubishi Pajero 3.2 DID automatic returns 26.6mpg. 

Hardly surprising really: the Mitsubishi has a five-speed gearbox compared to the Merc's six-speed unit, plus it's lugging around a heavier body and seven seats (the Merc's a strict five-seater).

Hope that helps.

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Hi David,

OK, if you're determined to go diesel and you need a reliable 60mpg plus then the only safe option is to get yourself a Golf BlueMotion. Your Polo plus your budget should get you easily into one, but you have to remember that getting good fuel economy is actually all about your driving style. We recently managed to get better than 60mpg out of a 1.2 TSI petrol Skoda Rapid, and that was with four big blokes on board...

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Hi Andrea,

Yes, it's a cracking idea. While the old Santa Fe isn't as sophisticated as the current one (hardly surprisingly) it's still an excellent used buy, very reliable and nice to drive. 

A figure of 100,000 miles on the clock shouldn't be a significant hurdle as long as the service history is all up to date. The basic rule of thumb is that four-wheel drive and automatic gearboxes always add to the fuel consumption. The auto box on that generation Santa Fe wasn't the greatest so I'd say stick with a manual and 4wd is down to where you live - if you regularly need rough road or slippery surface capability it's worthwhile, if you live in town then not much.

Let us know how you get on

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Hi Bernard,

Oddly, they're identical. According to the official figures both the 2001 1.8 turbo 150hp Golf GTI and the 2006 Octavia RS 1.8 turbo 180hp return 35.3mpg on the combined cycle.

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Hi Michael,

Depends which model you're talking about. The basic 87hp 1.4-litre petrol Astra returns an official 51.4mpg, while the 100hp version returns... Um, exactly the same. Meanwhile, the 140hp 1.4 Turbo Astra does 47.9mpg. If you mean the old-shape 1.4i Astra, that does an official 44.8mpg.