Ask Honest John

Honest John Ask Honest John » Why is the fuel economy so poor in my Vauxhall Insignia?
What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks

Why is the fuel economy so poor in my Vauxhall Insignia?

I recently purchased a 2009 Vauxhall Insignia 2.0 diesel with 140.000 miles on the clock. It has a full service history and drives well. However, the fuel economy isn't very good. I average 36mpg, yet the car should give at least 45mpg, Is this a sign that the car has an issue?

Asked on 23 September 2016 by Marian

Answered by Honest John
I tested this model some years ago and averaged 55mpg. But soon realised that a lot of this was down to the hard, low rolling resistance tyres. Probably 5mpg. Give it a proper check on Shell V-Power Nitro Plus over 200 miles or more. If you're still not getting 45 then something wrong. Probably worn injectors.

Real MPG enables you to register the fuel economy you are actually getting against your make and model of car, its engine and type of transmission.

Every time you enter an average consumption figure against your car, the overall average automatically adjusts to reflect it.

Real MPG
Similar questions
Do you know what the MPG is on a Vauxhall Isignia 2.0CDTI Exclusiv?
I looked at a 2009 Vauxhall Insignia Tourer 2.0CDTi Exclusiv yesterday, the dealer's own ex-demonstrator with 7300 miles on the clock and priced at £16,495. I'm part-exchanging my 2004 Vectra Energy 2.0...
I have a Vauxhall Insignia and all seems mechanically sound with 68000 miles on the clock, a recent service and full service history plus new discs brakes all round. When I bought it I was getting around...
Related models
Superb ride comfort, excellent efficiency from the diesel engines, practical and spacious.