Question about 2008 Toyota Highlander

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Right after my 2008 had its recent oil change (impeccably maintained) the numbers on on-board computer changed dramatically. Mileage range went from 370+ down to 300, and mpg went from 20 down to 11! Yesterday spent $400 on tune-up, Service just shakes their heads saying they have no idea and they'd have to do some very expensive check of everything. They adamantly suggest it's my driving, or that computer has to "reset" itself. After fill-up this morning, cruising range read 298. I put 125 highway miles on every work day. I depend on those readouts, and my driving hasn't changed. I've researched this for hours and can't find anything. Help?

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Call your local dealer and ask for the mpg reset instructions...or check autozone.com. should be hold a few buttons down for a sec or three!

Posted on Nov 02, 2014

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Posted on Jan 02, 2017

  • 1861 Answers

SOURCE: 2005 Prius change in MPG after dealer service

What was the weight of the oil that was put into the engine when it was changed? Prius engines are VERY PICKY about the proper weight of the engine oil. Trust me. I see this quite often. The wrong weight oil can do bizzare things, and def lower your mileage. Something you can check: Take off the tube leading to the throttle body, and look down into the intake. Do you see any oil laying in the intake manifold? If so, you DEF have the wrong weight oil. This will NOT set a Check Engine light, either. Hope this helps.

Posted on Sep 11, 2008

  • 3 Answers

SOURCE: Fuel Economy has dropped dramatically

CHANGE YOUR AIR FILTER!!!! INSTALL A PUEROLATOR OR FRAM AIR FILTER FOR THE MODEL YEAR OF YOUR CAR. I DID THAT FOR MY 2007 CAMRY AND I PROBABLY PICKED UP 3-4 MPGS. THE TOYOTA FILTER MIGHT BE TOO RESTRICTIVE!!!

Posted on Dec 17, 2008

  • 277 Answers

SOURCE: Cruise goes off when left or right signal is used.

you may need to change your signal/cruise control device. You may try an auto recycling center.
Remove the positive wire from the battery
remove screws at the back of the airbags. Don't worry, you disable them when you remove power,
With a socket 1/2in drive and maybe an 18 or 20 remove steering wheel
Once the wheel is remove you should see your signal/cruise device.
You could go to your local auto store and buy a book or online www.hayes.com and it will help with the procedure

Posted on Jul 31, 2010

  • 7353 Answers

SOURCE: I'm proudly own a 1995

verify good spark plugs and correct ignition timing. make sure the engine is getting to correct temp (195f) Has the mileage always been this bad? be sure the cam timing is correct.

Posted on Aug 30, 2011

  • 59 Answers

SOURCE: The other day I was

loose connection somewhere in main harness.

Posted on Sep 25, 2011

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