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walter_the_great

Dropping MPG

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i have been driving my diesel this morning, i have noticed when i was stopped(traffic lights etc.) the mpg meter was dropping very fast(38.3 down to 7.9mpg!!!) but when i drove off the computer would gradually go up again. I used to get 42.8mpg before thhis started. Any ideas on what could be wrong?

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What car is it? What reading did you have showing on the dash (was it instantaneous or cumulative)? How far had you driven when this was happening?

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its a 2000 vectra 2.0 dti, the mileage drop was cumulative, my bro was driving it last night, and i was first thing in the morning, i was only driving for about 20mins before i noticed it

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Sounds to me like the computer's up the swanny. Check the miles travelled against a full tank of fuel and see what you're getting. 169144-ok.gif

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Of course it will drop like mad whilst sitting at lights, you are getting 0mpg at that time.

Just reset it again and leave it for a while, after 1000 miles it will really settle down and only change every few days, but it will be up and down like a yo-yo for the first few miles.

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