hi got 53 plate 2.0 dti vectra and it uses alot of diesel, i put a tenner in and get 53 miles on long journeys, have serviced it and new egr valve but still same can anybody help thanks

nigel butler, December 2011

Is the engine management light on when running, if not does the bulb work?

£10 at £1.32/L is about 7.5 Litres, which is about 1.65 Gallons.
53 miles for 1.65 gallons gives just over 32 mpg, which isn't great, but it depends on how the car is used.
If you are driving hard with the car loaded up, wrong tyre pressures, dragging brakes and a leaky fuel line it's pretty good mpg.
If you drive efficiently, and the car has been professionally serviced (ie not just oil-and-filters changed at Kerbside Motors) it's pretty poor mpg.

If it's the latter I'd start by checking the coolant temp sensor and MAP sensor, easiest way to check is get it on some decent diagnostics and read the LiveData. These are not normally checked during service, and can put out faulty signals without putting the EML on.

hth, December 2011

That works out at aprox 57.8 mpg that sounds reasonable?? the only way to accurately check the consumption is to fill it to the brim, drive for 100~200 miles then refill to the brim and convert the litres added to gallons then divide the distance by the gallons added to get the MPG just judging on £10's worth is not an accurate way of measuring the consumption.

Rely on MPG and not £s per distance travelled

nigel, December 2011