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Fuel ?


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Good evening,

I know this topic has been discussed before but if somebody could explain to me in simple terms it would be appreciated.

I filled my Jag up with supermarket diesel before I found out the car would run better on named brand fuel.

Now I am due to fill up again and would like to know what the difference is and how the named brand is better.

I got 32mpg on this tank of fuel which is more than I expected to get with the big cat. I travel 50 miles a day consisting of 36 miles motorway and 14 miles a roads/town centre traffic.

Thanks for listening ,


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Hi Gary,


I am advised that the branded fuel, Shell, Esso, BP etc has various additives that suit performance engines whereas supermarket fuel has not.  Some drivers put various additives in the fuel themselves.


I am assuming at your car is powered by the 2.7 diesel as is mine in which I got 53 mpg on a mixed roads drive of almost 100 miles in which the motorway was speed limited to 50 mph.  The return journey showed 49 mph when I was able to give the car a bit more speed.





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Good morning Peter,

I've got question if you don't mind. My 2.7 diesel temp sits between 1/4 and 1/2 but I've read on the forum it should be on 1/2. Is this something that needs looking at ?

The cars runs fine and the heater is getting hot enough it seems.

Thanks for your time ,


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Hi Gary,


My temperature gauge sits on exactly half way, but I have had cars where the gauge sits about a third up.  I have had cars of the same make [11 Ford Escorts when I had company cars] and each one had a slight difference.


If the car is running well, and the climate control is working I would not worry too much about it.





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I have a 3 ltr S Type and if I put normal unleaded fuel in it , the engine management light comes on, I forget the code but its something to do with emissions, clear the fault and put the good stuff in it and its ok.

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