Last post on Dec 30, 2010 at 7:21 PM
You are in the Hyundai Elantra
What is this discussion about?
#131 of 158 Speedo Error 2007 Elantra - Now MPG Query
Oct 01, 2007 (10:35 am)
My MPG since being reprogramed is about 2-3 MPG less than when I got it in Feb. 2007. In town with air is running 24-25 MPG. I fill my tank to the very top each time I fill. Granted it takes longer but if you stop when it shuts off itself, my car takes about 3-04 more gallons. That is where people are getting their huge in town and road MPG.
I was at the dealer this AM for an oil change. I asked him about the letter and re-programming. This dealer had done a re-program on mine in June 2007, long before Hyundai finally came out with one officially. He told me they wanted to check mine to make sure it had the #91 re-program per the TSB which it does have. So my car has been OK since June 07. Get your cars in and get them fixed up guys. The wait for some of you is still better than buyng new tires. The dealer also said the 3% additional miles should be automatically extended once your car is fixed.
Back to MPG. No matter what, this 2007 gets better mileage than my 2001 ever got. Have no idea why but it does even with the re-programming done.
#132 of 158 Re: MPG Question [he07drivr]
Oct 01, 2007 (1:03 pm)
Yeah, Sorry the EPA gas mileage is not really the manufactor's mileage, it's determinted by tests which you can read about here. http://www.epa.gov/fueleconomy/, A goverment Agency.
#133 of 158 Re: MPG Question [tsmorty]
Oct 01, 2007 (1:20 pm)
I usually fill up when the gauge gets around 1/4 tank and I fill it up using the slowest pump setting. Usually I get 26/27 MPG from the computer and less than 1 MPG better than that based on my math (from the refuel amount vs. miles).
The reprogram was done only 5 days ago and that includes a long highway trip, so my numbers for this tank aren't representative of my usual driving. However, I am seeing MPG numbers about 1 MPG less than I would expect.
If I took it easy (~60mph on the freeways), I'd prolly be getting at least 29/30 MPG. However, frequent driving near/over the speed limit really makes the MPG nose-dive.
#134 of 158 Re: Speedo Error 2007 Elantra - Now MPG Query [ebbuts]
Oct 01, 2007 (4:40 pm)
What part of the country are you in, i.e. how cold was it from Feb to June, when you started using the A/C?
We all know A/C cuts MPG. My experience says that temps below 50 also cost MPG. So, if you're not in a cold climate, say above 50* from when you got you car until you started using the A/C you were probably driving under better MPG conditions (although you had the break-in period).
Reprogramming the speedo will not affect the MPG.
#135 of 158 Re: This is eye-opening...thanks all [backy]
Oct 05, 2007 (6:00 am)
Thanks! Carmax has a loaded one for a great price, I may go drive it to see what it's like.
#137 of 158 speedo error 2007 Elantra
Oct 05, 2007 (8:56 am)
Yes programming will effect the MPG. Why do you think Hyundai gave you some extra mileage on the warranty? Simply because before programming you were getting more miles on your car than after re-programming. So with more miles wouldn't your MPG be greater? Just common sense.
#138 of 158 Re: speedo error 2007 Elantra [ebbuts]
Oct 05, 2007 (4:45 pm)
Sorry, I should have said the actual MPG. I can see how it appeared I was talking about calculated MPG.
However, you're talking about an MPG reduction of probably 5 to 10%. Yet the warranty increase is only 3%.
Something doesn't add up. If your odometer was registering 3% higher and you drove 100 miles, the odo would read 103. Project that to 300 or 309 miles. Assuming a 10 gallon fill-up, you'd be looking at a .9, not 2 or 3 MPG difference. A/C usage will account for some of the difference, temperature range will also.
#139 of 158 MPG discussion continued
Oct 06, 2007 (3:17 pm)
I apologize in my original post about the "demanding" part. I was getting a bit angry. When I was shopping for cars, I was basing my purchasing decision heavily on price, MPG (according to the posted info online and on those info sheets they place in the window), warranty, and size/comfort inside [in that order]. So that being considered, are the MPG estimates that were posted online and on those car information sheets still accurate in estimated MPG? If they were to run those exact tests on the exact car again, only after the re-calibration, would the results still be 28 MPG city, 35 MPG highway? Because if that is NOT true, that is false advertising and depending on how much lower those estimate were, that may have effected my purchasing decision.
My current calculated mpg is roughly 28 mpg (during non-ethanol gas months). I drive about 40% city, 60% highway with the A/C on in moderate/mild temperatures. After I get my car re-calibrated, I'll post my new calculated mpg.
Oh, and here is another thing; When they re-calibrate the car, do they modify the odometer to reflect what the mileage should have truly been? Because I am close to qualifying for an insurance discount for driving under 10,000 miles/year, and missing out on that because the car was over-reporting mileage is going to irritate me.
#140 of 158 Re: MPG discussion continued [he07drivr]
Oct 08, 2007 (10:57 am)
the testing standards the EPA uses is based on human calculations, not on the trip computer.
Also, the MPG on the window stickers is based on EPA numbers, so no, its not false advertising, cause they aren't hyundai numbers.
No, they don't modify the odometer. Hyundai has extended the warranty 3%, and 3% of 10000 miles is only 300 miles, so you should not worry. Besides, what does your insurance company do, come out and check you mileage every year?