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Premium Member
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3,572 Posts
Could it be that the thermostat is stuck wide open?
Is there any variability in the display between stop go traffic and motorway for example.
A car that is being over cooled or thinks it's over cooled will tend to use a lot more fuel.
Welcome to the Forum btw
 

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Super Moderator Technical Supremo Platinum Member
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22,040 Posts
Sounds like thermostat.
To check.
From cold start, see if top hose to radiator gets warm while engine is warming up.
It shouldn't until engine is at working temperature.
 

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Premium Member
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408 Posts
mine does exactly the same , shows nothing, the the 1 bar for about a mile or so then its up to temp, gauge never flickers, doesnt use oil or coolant and get proper toasty in the car and quickly even in minus figures
 
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