Question about BMW X5 Series

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My 3.0L 2008 X5 has a sudden drop in gas mileage of 25%. I didn't change my driving style at all just a one tank ful to the next drop in mileage from 400 miles to the tank to 300 miles per tank. The engine also takes longer to start than before. The starter cranks 6-9 times before the engine starts vs 3-4 turns before. The dealer claims to have done a diagnostic check and found no problems, can you help?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: High fuel consumption

Check the following things: air filter, wheel alignment, and timing belt, all of them if not serviced on time can affect your fuel consumption. I do not think its the heat because I drive my car in Phoenix AZ with temperatures comparable to Dubai and I still get 500+ km/tank.

Good Luck,

Alex (Civic 2003 1.7 manual)

Posted on Sep 06, 2008

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Mikey108
  • 475 Answers

SOURCE: poor gas mileage on my jeep liberty

Did this happen overnight or was it a gradual loss? Did you do any kind of repair before you lost the gas mialage? Is there a check engine light on or did it come on and go off? Did anything weird happen before the jeep got bad gas mileage? It's hard to diagnose a problem like this without actually touching the car.
Any other info might help me steer you in the right direction.

Posted on Nov 24, 2008

Tech Jenkins
  • 359 Answers

SOURCE: jeep liberty gas mileage

when was the last time you put in fuel injector cleaner? I put in Lucas Oil Injector cleaner every other or every oil change.

There are alot of factors affecting your gas mileage. Tire wear, tire pressure, wheel alignment, air filter, fuel filter, spark plugs, oxygen sensors, just to name a few. So to say what you need is just shooting in the dark without more information. I would probably start with your oxygen sensors, and then perform a tuneup. If your vehicle pulls to one side or the other when driving on the highway you need to stop into the shop for a wheel alignment.

Posted on Nov 24, 2008

  • 491 Answers

SOURCE: drastic drop in gas mileage

well you may need to have it serviced even though your not too hard on it. try a complete tune up and see how the milage is affected

Posted on Dec 22, 2008

  • 76 Answers

SOURCE: poor gas mileage on my jeep liberty

change your spark plugs if they haven't been changed in awhile. check your tires for the propper psi there should be a sticker on the inside of your drivers door that will tell you recomended air pressures go by this not the recomendations on the tires. also where are you getting you gas does it contain ethanol sometimes this can burn faster.

Posted on Feb 05, 2009

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