Why is my Avensis not as econimical as it used to be?

I've a problem with the fuel range on a 2008 Toyota Avensis D4-D 2.0 T2. Mileage is 100,000. Until recently when I filled up with diesel I got a range of 620 miles for a tank of fuel; now I'm only getting 590 miles. Can you please tell me what the problem is and how I can sort this please?

All information gratefully accepted.

Martina Lynn (Ballina)

Jan 2015 Filed under: fuel economy and emissions

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Expert answer

Hi Martina,

There are many possible reasons for this drop off in your fuel economy. Start with the easy things - you'd be surprised how important they are.

1 - Are you carrying extra weight in the car now than you were before? Golf clubs (or bricks!) in the boot? It can have a large effect.

2 - Have you fitted a roof rack/box? Again, can have a massive effect.

3 - Check the air pressure of your tyres. This is very very important. Underinflated tyres cause extra drag, requiring more fuel. Don't over-inflate either though, as that could lead to a blow-out. Follow guidelines for the car/tyre.

4 - It's winter so you're most likely using the lights, heater and demister a lot more. Those all use fuel. In particular, make sure you turn off the rear window demister when it's not needed - it uses a lot of energy.

All the above you can do for yourself, so do and then see if things have improved. After that we would suggest that you have your car serviced if it has been a while. The air filter and/or fuel filter could be clogged and it's a good time to hook the car up to a diagnostics machine to see if there are any error codes indicating other issues.

Let us know how you get on

Shane O' Donoghue - Complete Car Adviser
@Shane_O_D