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Originally Posted by Wagner
Normal, actually better then average for a 7 year old X5. New ones average between 17-18mpg.
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Rubbish.
My 2001 with a manual gets 17-18 city and 22-23 highway. That is with no mods with stock wheels and OEM spec tires.
Check the following:
Oil condition
Spark plugs
air filter
oil seperator condition
tire pressure
operating temp of engine
And if the fuel filter is old, it might be a good idea to replace that as well.
The only thing I changed about the car is that all my fluids are Royal Purple or Mobil 1.