Last post on Jul 30, 2013 at 4:45 PM
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Hyundai Elantra, Automotive News, Car Comparisons, Car Buying, Sedan
Dec 03, 2008 (1:17 pm)
...in most cases, using a higher octane gasoline than your owner’s manual recommends offers absolutely no benefit. It won’t make your car perform better, go faster, get better mileage or run cleaner. Your best bet: listen to your owner’s manual.
My manual said the mileage testing was done with the higher octane. And I put in high this one time to see if I got better mileage just to see what they were saying. I always use regular gas. I wanted to test my car out to see if there was a better mileage change...thats all. My owners manual states regular is what you can use but it does not say you can't use premium. But it also states you can't put more than 15% ethanol that is in the gas in the car
#485 of 515 Re: MPG [schukanuoslady]
Dec 03, 2008 (6:03 pm)
One tank of gas, unless under closely controlled conditions (speed, temperature, route driven, rate of acceleration, etc.) is not a large enough sample to tell you if you get better mileage from premium gas.
I buy almost all my gas at the same station and usually go about 2 weeks or more on a tank. It is quite common to see .4 mpg +/- from one tank to another.
My driving routine doesn't change much from week to week. But, if I drive an extra 20 highway miles compared to local miles, my milage usually increases. However, if I go to a drive-up window and have to wait 5 minutes, that decreases the mileage (0 mph = 0 mpg). Also, your fill up could be off by 1/4 or 1/2 a gallon. If you've only driven 300--400 miles between fill ups, that small gallonage will affect your calculated mpg.
#486 of 515 Re: MPG [schukanuoslady]
Dec 04, 2008 (7:39 pm)
My manual said the mileage testing was done with the higher octane.
Would you mind telling us exactly what the car's manual says about using higher octane for testing fuel economy? I find it very odd that Hyundai would do the EPA fuel economy tests for the Elantra using a higher octane of gas than is recommended for the car.
#487 of 515 Higher octane != Higher milage
Dec 04, 2008 (8:41 pm)
Around here, 100% gasoline (0% ethanol) is 87 octane. 90% gasoline with 10% ethanol is 89 octane.
However a 10% ethanol mix actually gives you 6%-8% lower MPG, at least that is what I have experienced over the last 7 months that I have owned my 08 Elantra.
On another note, the weather suddenly dropped from 35 degree highs to 15 degree highs, and this latest tank of gas, which unfortunately has 10% ethanol, my MPG in town has plummeted to 21.5 MPG. This summer (80-90 degree days) and fall (40-70 degrees) I was able to keep in-town MPG at 25 with 90% and 27 with 100%
I am driving the same exact roads at the same time and there is not snow/ice yet causing additional stopping/change in driving habits, but I am concerned the cold alone has significantly seemed to have dropped MPG this much. (No, I am not letting it idle after startup for any longer than usual, that will start once the temps drop below 10.)
Car milage is only 3800 after 7 months.
#488 of 515 Re: Higher octane != Higher milage [fargond]
Dec 04, 2008 (8:51 pm)
Did you notice different behavior re fuel economy with other cars you've owned, i.e. didn't you notice a drop in FE with cold weather with them?
Have you adjusted the pressure in the tires for the colder weather? It drops about 1 psi per 10 degrees of temperature. If you haven't adjusted it since last summer, the tires could be underinflated by several psi now.
Keep in mind that the colder the weather, the more energy has to go to heating up the engine when it's cold. That has nothing to do with snow/ice or a change in driving habits.
As you noted, on the latest tank of gas it's 10% ethanol. That will bring down FE around 10% by itself compared to non-ethanol gas. FWIW, in my town we have 10% ethanol in all grades of gas, even the 87 octane stuff.
#489 of 515 Elantra takes time for temp gauge to move...
Dec 09, 2008 (9:35 am)
I have an I have a new 08 Elantra (purchased in summer) and I noticed that it takes about 7 or 8 minutes of driving this winter to get the temp gauge to the ideal range. Whereas my other vehicles are literally twice as fast at warming up. Should I be concerned? Also I would like to add I never let the car sit and idle to warm up, I usually start it and let it sit for about 30 seconds in the garage then drive, also I live in KY. Thanks!
#490 of 515 Auto Door Locking
Jan 01, 2009 (10:27 am)
Many of you may have experienced this problem. If you use the key fob to unlock the doors on your 2008 Elantra, and you don't manually open one of the doors within 30 seconds, all of the doors re-lock. Kind of annoying - so I asked the dealer if there is a software fix/change, and they don't know of any.
Anyone experience this with their Elantra and/or know of any fixes to the problem?
#491 of 515 Re: Auto Door Locking [riguy]
Jan 01, 2009 (2:20 pm)
The relocking of the doors after 30 seconds is not a problem. It is a design feature of the car and it also re-arms the alarm.
My '05 Sonata has this feature and it is explained in the owners' manual.
#492 of 515 Re: Auto Door Locking [riguy]
Jan 01, 2009 (3:25 pm)
"Many of you may have experienced this problem. If you use the key fob to unlock the doors on your 2008 Elantra, and you don't manually open one of the doors within 30 seconds, all of the doors re-lock. Kind of annoying -"
The same thing happens with my 2008 Elantra with the remote key. If I open it while walking towards the car it relocks on me before I get to it.
#493 of 515 Re: Auto Door Locking [bhmr59]
Jan 01, 2009 (4:06 pm)
I just got a '05 Jetta today and I see that it has the 30-seconds re-locking feature also. IMO this is a nice security feature; e.g. it is possible to accidently press the unlock button on a remote, and should that happen (say, as you are walking away from your car in a parking lot), the car will automatically re-lock.