Acceleration surge and gutsy on fuel

2009 Vauxhall Antara 2.0 cdti se manual
Car: Vauxhall Antara
Year: 2009
Variant: 2.0 cdti se manual
Categories: Running Rough, Starting & Power Loss
as im driving on motorway mostly it feels as though im driving an automatic that changes gear as it seems to slightly accelerate on its own.also it tells me that doing 68mph on motorway with cruise control on, on the flat, im am doing 22mpg. this surely cant be right as it should be doing about 40mpg.anybody know if there is a problem.
Problem added: Jul 26, 2009 (14 years ago)
i have had this problem sorted now. vauxhall told me that it is a problem that they know about. all that needed doing was the software updating. so why wasn't i informed of this problem?
Answered Jul 31, 2009 (14 years ago)

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