Expert answer

Hi Gerard,

You didn't specify if you're interested in a new Corolla or a used one, but here are the figures for the latest model:

• Toyota Corolla 1.3 Dual VVT-i (petrol): 5.8 litres/100km (48.7mpg)
• Toyota Corolla 1.4 D-4D 90 (diesel): 4.7 litres/100km (60.1mpg)

Come back to us if this doesn't answer your query.

Expert answer

Hi Ciaran

I couldn't look past a Mazda MX-5 for that money, but since I'm no expert on the Jap import stuff, I though I would ask Paul Healy @bespoke32 who does know a bit. He said "The main problem associated with the Toyota Levin and its twin brother the Trueno is related to the Superstrut suspension. This is a complicated set-up that mimics a dual wishbone system  giving the car better handling. Unfortunately it is also expensive to repair if it goes wrong. Some owners replace the whole system with a conventional suspension when the Superstrut fails while others have splashed out on the right parts to keep it in place. Look for the second kind of owner and ask questions about the Superstrut.

The Levin was launched to take on the Honda Civic Type R and SiR but even the range topping BZR model is noticeably slower. The quoted figures of 160bhp+ only apply to cars run on higher octane Japanese fuel and the Levin seems to come of worse than its competitors when run on Irish juice.

The aforementioned Honda’s post closer to their factory figures as too does the Nissan Pulsar VZR and the Mitsubishi Mirage Mivec. If insurance allows the Honda Integra Type R or SiR would be our pick.

Unless you are specifically looking for a modified/tuned car aim for one that is as untinkered as possible. There are just too many problems that could arise from somebody else’s bad work."

Expert answer

Hi John, 

The Atkinson engine is a type of engine invented by James Atkinson in 1882. The Atkinson Cycle is where the stroke of the piston can very in length across the four cycles in a four-stroke internal combustion engine. The length of the stroke during the power cycle is increased to promote efficiency, but because this comes at the expense of a shorter intake stroke there is some loss of power and therefore this engine design is best suited for use in hybrid systems where the electric motor can make up for some of the loss of power. 

In conventional four-cycle petrol engines, fuel enrichment is sometimes necessary to cool the exhaust gases, preventing degradation or destruction of the catalytic converters. In an Atkinson cycle engine, compression and expansion are not symmetrical, and the valves close late, delaying compression. This creates a high expansion ratio for less compression, reducing intake and exhaust energy losses and converting combustion energy to engine power more effectively. As a result, the exhaust temperature is lower than that of conventional engines.

The current model Toyota Prius Hybrid uses a 1.8-litre Atkinson Cycle engine. Adopting the Atkinson cycle and a cooled exhaust gas recirculation system brings significant gains in fuel efficiency and emissions reduction.

Prius 1.8-litre Atkinson Cycle engine

Because the intake valves close late in an Atkinson cycle engine, compression is delayed. This creates a high expansion ratio for less compression, reducing intake and exhaust energy losses and converting combustion energy to engine power more effectively. As a result the exhaust temperature is lower than that of conventional engines. Cooled Exhaust Gas Recirculation reintroduces the cooled gas into the intake system, further reducing engine operating temperatures.

Other models to use Atkinson Cycle engines include the Lexus CT200h, Lexus RX 450h, Mercedes S400 Blue Hybrid

Expert answer

Hi Hennie,

I'd be interested to know how you found out that this is happening! Anyway, it's likely that the injector has clogged up with unburned fuel. If this is a petrol car then the best route is to simply replace the injector. A diesel injector costs a lot more though so it may be possible to go down the reconditioned route.

Hope that helps.

Expert answer

Hi Sinead,

Without hesitation I would advise you go for the 2011 5 Series over the older BMW X5. The new 5 Series is an absolute gem of a car and if you can stretch to the Touring estate model then it'll be even more spacious. The 520d is far better on fuel than the X5 and will cost you less in road tax too. On top of that, being newer, the 5 Series will have more of its warranty intact.

However, I urge you to go to a dealer and drive both, as the 5 Series is much lower down than the X5 and, while that's not important to me personally, it may be to you. Only one way to find out!

Let us know how you get on.

Expert answer

Hi Martin,

We really rate the VW Group's new 1.6-litre TDI engine. It's quiet, refined and great on fuel. However, while it's relatively torquey, it does feel a little short on power when it's lumbered with a lot of weight to carry around. You're in a good position being able to afford either engine. We'd definitely recommend you go for the 2.0-litre TDI Passat in this case. It's a great car and has plenty of power to carry around the family.

If you need any further help, please do get in touch.

Expert answer

Hi Sean,

Out of the three cars here, by far the best value under scrappage is the Hyundai i30. You could have a petrol model for as little as €13,995. The diesel is €15,495, which is quite a bit more. If your annual mileage is small then you should perhaps save some money and buy the petrol model. I know everyone buys diesel cars these days but the petrol alternative will only cost you €52 more than the diesel each year to tax and if your mileage is low then you wouldn't see much of a saving on fuel in the diesel car anyway.

The Peugeot 308 is comfortable and good on fuel.

If you are planning on changing the new car quite soon, then the Focus will be worth the most money as a trade-in, but I think the Hyundai would be the best buy in this case for you.

I hope this helps.

Expert answer

Hi Laura,

I reckon the Fiat Sedici would be perfect. It is a small car with good fuel economy (from a diesel) that also happenes to come with four-wheel drive, which would make towing really easy. We found one that is within your budget and I reckon it would be a super little car for you.

Hope that helps

Expert answer

Hi Bill,

As with all such jobs, we'd recommend it is done by an experienced mechanic. Special tools are sometimes required to remove these connections from fuel filters, though most of the time they're held on with clips that need to be pushed/pulled or squeezed in a certain way.

If you send us on a photograph we may be able to give you more specific advice.

Expert answer

Hi Peter,

Diesel cars are now outselling petrol cars by 3 to 1 and of the petrol models that are selling, they are mainly small runabouts. The fact is that the majority of people are being drawn to the lowest possible road tax and in some cases, oddly, this means that they are actually spending more on the car then they really should have. There seems little sense to spend €2,000 - €3,000 more on a diesel car if you are saving €50 a year in road tax and your mileage is low, but that is the way it seems to be happening right now.

The problem with this is that buyers are missing out on on some really good petrol cars. Fiat and Volkswagen in particular have some smart new petrol engines. Take for example the Jetta, which you  mentioned: the new one is out now, but in the older model there was a 105hp 1.2-litre TSI petrol engine and most people baulked at this because they thought it would be too weedy for the car. The same is true of the 1.4-litre TSI, while both are more than capable of adequate performance. 

In terms of fuel economy, sure enough the diesel will usually trump the petrol, but this will only really start to make monetary sense when you do a lot of mileage. It you intend on high mileage, then you are probably better off sticking with the diesel car - Volkswagens are generally quite good at mega mileage, as are Skodas.

We've been getting quite a few queries about DPFs (diesel particulate filters) here in CompleteCar.ie but Mazda appears to be the only brand showing up faults. The Passat though has not been without its troubles and, to be honest, I am not sure if I would be buying a used one with a lot of kilometres on the clock if big mileage is likely.

You mentioned the Jetta, well this one we found would be a top buy. It has just 14,000 miles on the clock, the right 2.0-litre diesel engine and is within your budget. This would be a good buy.