I have posted 2 questions on the MPG of other members cars.
When i first got mine i was getting 70miles for half a tank of fuel

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The car went back twice and the secound time they re-did the computer and now the MPG is around 117 for half a tank

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Many people have said that its the way you drive, the car having to be run in and that the car needs to warm up!
Many of the above will help but in the end if you dont feel happy with what you are getting then take it back to the dealer and ask then to have a look at it.
I have been doing a post where you post your information on the type,miles completed,year and eng size and from what i can see the miles completed (2000 or more) seems to play a part in you getting a better MPG.
New 53 Plate allure, Blue, one of the first in the UK.
Car has been rejected.
04 plate 1.6s same spec as the Allure.
mods to date:
:Rear lex lights.
:Wind stop.