what's caused my mileage to drastically drop from 28 mpg to 15 mpg?

Asked by Oct 21, 2016 at 02:47 PM about the 2004 Hyundai Santa Fe GLS 2.7L

Question type: Maintenance & Repair

What parts cost to fix this. What pars do I need to
try to fix

6 Answers

25

Have you changed your driving or added weight inside the vehicle

109,575

When is the last time you did a complete tune-up on the car ???? are your under inflated ???

Check the air filter first. That's the most common cause.

76,685

Does the car have a lot of miles on it? If so it may be worn out but I would check the catalytic converter to see if it is plugged up. Like joemom says do a tuneup and check the air in your tires but those would probably only account for a 10% or so drop in mileage.

19,800

Also add some fuel injector cleaner to gas tank and clean throttle body with throttle body cleaner.

70,255

Is the transmission, if automatic, upshifting properly and into the highest gear? If not, that'll absolutely kill your gas mileage! Is the check engine light on? HTH. -Jim

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