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E12 1.4 D4D , Bad Mpg

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My corolla has been getting bad mpg for a while

Its not a case of winter driving, i allow for this but its worse than that.

Car seems to be driving perfect, no smoke or power loss that i notice.

I have had issues with EGR valve and fuel pump and these have been replaced but the mpg but has not been right since.

The only thing i do notice is the engine hunts very slightly when cold, very slightly now.

Anyone any suggestions ?

at the minute iam running diptane (fuel threatment) through the tank to see if that makes any improvments.

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when was the fuel filter last changed?

I would personally treat her a genuine new fuel filter and bg244 down the tank.


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Aw I change the fuel filter every 10-15k, just done last month again.

Gets an Oil change every 5k

Used to fill up at what I thought was a good name garage but mechanic friend says to stay clear so have changed garage and waiting to see if theres an difference.

As for the diptane, its Irish made and gets great reports thats why I was trying it, never used it before myself.

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