Poor Mpg

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I have a 2001 C5 2.2 Exclusive est auto with 68,000 on the clock, I've just had the injectors sorted at the cost of €650 (I'm in Spain) although I think he just cleaned them and put them back in, but that's another story, the thing is, The very best fuel MPG that I've ever had is 31.4 mpg, the car has been de-fapped and starts and drives well, however, it is the only C5 I've ever had/driven, Looking under the bonnet today I noticed that when revved up the turbo pipe doubles in size, is this normal?

I like the car and it all works except for the rear window not opening which isn't a problem, any ideas what my next move should be re the mpg please.

I would add that when I bought the car I did so long distance, I am in Spain So a friend in the UK bought the car, now the ad said how good the car was on fuel, well, before I picked the car up in the UK I had it serviced, and in doing so had a new cambelt fitted, if the new belt wasn't fitted exactly right, would that affect the fuel mpg and if so how can I check?

 

Thanks........Jeff

[Randombloke]

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