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Hyundai Elantra Real World MPG

295 messages,  Last post on Aug 14, 2008 at 3:30 AM

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What is this discussion about? Hyundai Elantra, Fuel Efficiency (MPG), Sedan

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#266 of 295 Re: poor mileage on 2008 elantra [fargond] by bhmr59 May 20, 2008 (4:47 pm)
Replying to: fargond (May 20, 2008 3:01 pm) The computer measures your gas consumption against your mileage. It does NOT estimate.   You are estimating the crap out of everything, using the gas guage to tell you how much gas is left when you don't even know how much you started with, and then over filling your gas tank.   9.33 gallons for a 14 gallon tank (regardless of guage approximation), I'd say that was in the range of a 2-2.5 gallon overfill. Replies to this message: fargond (May 20, 2008 6:39 pm)
#267 of 295 Re: poor mileage on 2008 elantra [bhmr59] by fargond May 20, 2008 (6:39 pm)
Replying to: bhmr59 (May 20, 2008 4:47 pm) Like I said, I will not routinely overfill, but wanted to know what the level differences / maximum amounts were.   I realize the on board computer is pretty accurate but doing your own measurements helps confirm. As I mentioned, I know that due to the overfill and low # of miles, the own-computed numbers are NOT accurate. But it still provides a good comparison when others, like Hyundaihoney are only seeing 19 out of their trip computer and are concerned the car doesn't get the 25 MPG city that it is claimed to get.   I have confirmed that per computer, and per a 'regular' fill (not overfill) that indeed it does get 25 MPG city if you can maintain > 20 MPH average with at least 2 mile trip segments. The other poster was stating closer to 15 MPH with a much lower MPG, which makes sense and is why they're not getting advertized.   Just trying to post enough details for others that are concerned about all the numbers. After I do one long - all - interstate trip and verify highway miles, I will be good and not do detailed analysis until like a year later just to see if it goes up or down siginificantly indicating a problem if the onboard calculator doesn't report the same.
#268 of 295 Re: poor mileage on 2008 elantra [fargond] by lightfootfl May 21, 2008 (4:15 pm)
Replying to: fargond (May 20, 2008 3:01 pm) Try going 1000 miles, and checking the mileages. You will find a much more accurate measure. So far as a run down the road, for X miles, all you are proving is that you don't have any basis on which to measure your mileages. If you haven't averaged at least a 3 tank average amount you can't possibly be accurate. Even going by a single tank filled on both ends of the "highway" you are still only getting close, not accurate. Sorry, but that's just the way it is. van Replies to this message: backy (May 21, 2008 4:29 pm) lightfootfl (May 24, 2008 7:22 am) fargond (May 22, 2008 9:18 am) lightfootfl (May 24, 2008 7:25 am) canddmeyer (May 30, 2008 1:34 am)
#269 of 295 Re: poor mileage on 2008 elantra [lightfootfl] by backy May 21, 2008 (4:29 pm)
Replying to: lightfootfl (May 21, 2008 4:15 pm) Figuring fuel economy over serveral tanks is fine if all you want is an idea of what the car can do over a period of time, over varied conditions. But it's also useful to know what a car can do under specific conditions, like highway cruising over several hundred miles. What if the 3 tanks are like this (actual examples from recent experience with my Elantra GT):   1. Heavy city traffic, lots of stop-and-go driving over short distances and lots of idling, with low temperatures (into the 20s regularly), about 23 mpg average. 2. Long trip (about 450 miles) on the interstate, only a couple of stops, about 65 mpg average speed, temperatures in 40s-50s, about 35 mpg average. 3. Mix of city, suburban, and urban freeway driving, short-to-medium trips, temperatures 40s-70s, about 28 mpg average.   So the overall average is around 28.7 mpg. That is interesting in terms of what my car has delivered over that period of time, but not from the standpoint of what it can do under different conditions. I think both viewpoints are useful. Replies to this message: lightfootfl (May 24, 2008 7:22 am)
#270 of 295 Re: poor mileage on 2008 elantra [lightfootfl] by fargond May 22, 2008 (9:18 am)
Replying to: lightfootfl (May 21, 2008 4:15 pm) Re: lightfootfl   I realize all of this about averages. That's why I said *I realize* this is not an accurate hand-calculated estimate in my original post, and stated that. I guess I don't understand what was so controversial about the details I posted.   I posted what I knew, stating that with 1 tank, overfilled vs where it stopped, and the computer amount -- all to help Hyundaihoney in a similar comparison. It was all the data I had to work with so far.   I know all about needing to take multiple tanks, thousands of miles if you want to compare on your own calculations, or just use the built in computer as the guide.   I was trying to help another poster by giving the computer reported results in only 2x a long of a trip as hers, not state that my own fillup calc was accurate by any means.   I definitely know consistently, day for day, the built in computer shows that my short trip to work averages 27 MPG, on a per day basis, or on a weekly average or on the entire tank average. This is significantly more than hyundaihoney gets and even more than I expected. I just happen to have a low traffic/low turns/low stop trip to work.   Driving around to stores and across town today to another site for a off-campus meeting, I found my computer reported MPG dropped significantly due to many more stops, slow downs for turners, driving through parking lots, etc..   It (the computer calculations) definitely helps you plan the trips better and anticipate driving patterns. Something the per-tank calculations can't give you.   My guess is that Hyundaihoney is forgetting about how many actual pauses occur in her trip, that is causing it to drop to 19 mpg vs my 26-27 (and the EPA rated 25). It's not actual stop signs and stop lights... it's the turners, it's the parking lots and pauses to leave a parking lot counting as additional stops that just kill in town driving. Replies to this message: lightfootfl (May 24, 2008 7:25 am) canddmeyer (May 30, 2008 1:34 am)
#271 of 295 Re: poor mileage on 2008 elantra [backy] by lightfootfl May 24, 2008 (7:22 am)
Replying to: backy (May 21, 2008 4:29 pm) I agree with that, my point was only that you don't know the "MPG" of the vehicle by just using 1 tank, and 1 run down the road. I think of my own brother who figures his mileage by ?guess? from here to there is about x miles and I put in about y gallons so I got z mpg. not even using speedometer readings, or actual gas used. I think some of our posters are in his (my brother's) category. You are right for checking "only highway miles" and "city miles" separately. The actual overall mileage is the combination of everything, as we both know. van
#272 of 295 Re: poor mileage on 2008 elantra [fargond] by lightfootfl May 24, 2008 (7:25 am)
Replying to: fargond (May 22, 2008 9:18 am) Sorry to have come on so strong, but there are a lot of people, (see my post to backy, re, my brother) that can't figure mileage at all. I do understand your efforts to help someone with your example. Sorry I sounded so critical. van
#273 of 295 24 MPG by dhaneshgesota May 24, 2008 (10:39 pm)
my 2007 elantra gls with 3500 miles on it gives around 24 mpg overall.   I would estimate 60% city and 40% highway driving.   Is this a good mileage? Replies to this message: backy (May 25, 2008 7:24 am) cajim (Aug 12, 2008 11:08 am)
#274 of 295 Re: 24 MPG [dhaneshgesota] by backy May 25, 2008 (7:24 am)
Replying to: dhaneshgesota (May 24, 2008 10:39 pm) "It depends." On what your city driving is like (a lot of stop and go, idling?), what your highway driving is like (in-town with lots of traffic, or open-road?), and how you like to drive (very easy on the throttle, or zip around). Really hard to say without more information. Also, if most of your mileage to date has been in cold weather, that would have an effect too. Replies to this message: cajim (Aug 12, 2008 11:08 am)
#275 of 295 Impressed by mort4371 May 26, 2008 (6:26 pm)
So far in my 08 SE, I've been very happy with the mileage. Most recent tank really wowed me. I made a few round trips to work and a bit of general running around(about 150 miles total, about 2/3 highway, 1/3 town), then drove from central PA to DC (Dulles Airport, about 300 miles round trip) to pick up a family member. Total driving on the tank was probably about 95% highway miles.   Car has (at end of tankfull) 2000 miles, and I did intentionally drive very gas-friendly on the DC trip (set cruise at about 62, regardless of 55mph limit or 65 limit, avoided lots of unnecessary acceleration, etc) just to see what the car is capable of... Don't know if I can drive this mellow all the time, but doing so I was able to squeeze right around 40mpg highway from the car. Trip computer said 39.7 for the overall tank, and I filled 12.04 gal into the car with 481 miles since previous fillup (computes to 39.9) so gas used correlated pretty well with the computer.   The car could probably do even a bit better if Hyundai could conjure up a 6-speed box; engine RPM in 5th, even at my mellow cruise speed, is ballpark 2500. Squeeze one more cog in there, and drop engine speed to 2000-ish at 60-65mph, and it might do even a bit better.   I'll keep everyone updated with overall figures after another thousand miles or so.

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