MPG 16-17, with 93 octane in my Hyundai XG 350 L-WHy?
Poor mileage ever since I bought the car. The salesman promised 27-30 MPG in town. I get 16. 17 with 93 octane. I drive within the speed limit and am cautious. I purchased the car used with about 12000 miles on it.
An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert who has answered 1,000 questions.
Re: MPG 16-17, with 93 octane in my Hyundai XG 350 L-WHy?
Incomplete combustion due to ignition problems, poor compression, worn or broken EGR valve, sticking injectors, old O2 sensor, dirty air filter, and just about anything else that affects how well the engine would run.
Start with a code scanner to find out if there are any stored fault codes.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
The Fuel Economy of the 2004 Hyundai Santa Fe is listed as being 16 mpg in the city and 22 mpg on the highway.---------------------------------------------------------------------------------- Digiprog3 Odometer Correction Tool
I'm not sure what the problem is specifically, but I can assure you this--you're basically throwing money way (and possibly exacerbating the issue) by using 93 octane fuel. Your car is timed and tuned to run most economically and with best performance with 87 octane fuel. The higher the octane, the slower the fuel burns. Longer burn time can equate to more power, but ONLY if your engine is designed and tuned for this application. Couple of suggestions..checkto make sure your exhaust is "free". A plugged catalytic converter can really rob mileage. Tire pressure and air filter are worth mentioning as well.
Cause you're driving a bus. lol. Mileage will vary depending on what fuel you use, how you drive, and where you're located. typically what i've seen on trucks like yours, i'm asuming it's a 6.0 liter, is anywhere from 12-19 mpg. you should see around 15mpg for the most part. if you do a lot of in town driving, expect a lot less. @9-12. if it's less than that, i'd start lokking in to it. try running a K&N air filter and use synthetic engine oil. I've seen noticeable improvements with power and mpg's with that. Also, ensure that your tires are properly inflated as that can make a difference in mileage. use the recomended fuel octane and change fuel filters.
when the weather gets cold fuel mileage and power suffers due to idle time to warm the vehicle and also the fuel is mixed(blended) for the winter months one way to offset this is to use a block heater when parked for an extended amount of time,also use a higher octane gas,or even try a fuel/octane booster with injector cleaner and line antifreeze.hope this shed a bit of light on your problems good luck.
A really dirty air filter will knock down your gas mileage greatly....yes. Also keep in mind that you don't get as good of mileage around town, as you do on the freeway.....35 mpg isn't too shabby....oh and please give me a rating....thank you
I don't know from where you bought the car but do you feel certain that typical causes such as fouled plugs or clogged air filters are not at fault?
Most dealers, even the shlocks don't normally skimp on the simple stuff but who knows about a private source?
That does seem low, especially the city numbers. I don't think Hyundai is any leader in gas mileage but they are better than what you are getting.
You can use 87 octane, but first let me give you some food for thought, when you use lower octane than recommended the knock or ping sensor will ****** the timing to accommodate the lower octane fuel and prevent piston damage, this causes a loss of fuel economy and power, so the real saving is very small if at all, but yes your car will run fine in all but very hot climates, like the southwestern states. I hqave a Corvette, it calls for 91 Octane, I have run 87 in it to save money, but the fuel mileage drops 3 MPG, so I gave that up.
I have the same problem as talked about above. 2002 Hyundai accent gsi. HORRIBLE gas mileage. I only get about 320 km per full tank. My driving habits are good. i took it to the garage and they put it on the computer and no error codes showed up. Question: Can a MAP sensor be faulty but NOT show up on the computer diagnostic? I had my O2 sensor checked out and my exhaust, and changed the flex pipe. Car runs pretty good just horrible gas mileage and kinda crappy power. Changed fuel and air filter. Cleaned the fuel system entirely ($80 at garage not $4 bottle).