Hyundai Sonata 2006 V6 Mileage Statistics

Here are my fuel consumption records so far. Columns may not align depending upon the font. Copy the text and paste it into a text editor (Notepad) for easy viewing.
Mostly city driving with just the driver and with way too many signal lights. Vehicle was purchased in mid-December.
Date Gal Price Trip Meter Odometer Mileage 02/12/2006 15.38 2.219 296.8 1295 19.3 02/26/2006 14.02 2.059 272.3 1567 19.4 03/11/2006 16.86 2.239 369.9 1937 21.9 04/01/2006 16.41 2.579 341.4 2279 20.8 04/14/2006 13.53 2.839 290.5 2569 21.5 04/15/2006 15.38 2.779 400.0 2969 26.0 <- All highway 04/25/2006 15.50 2.839 347.0 3316 22.4 05/05/2006 11.34 2.849 248.8 3566 21.9
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Those seem pretty consistant with what I got at first too. I will tell you that around 5,000 miles my MPG went up considerably. I now get on average 24-26 MPG on the highway AND/OR the city streets
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wolfcub27540 wrote:

What time of year did this occur and in what area? My mileage took a huge jump also, but I'm pretty sure it coincided with the seasonal switch from winter to summer gas blend. I'll know for sure this coming winter...
Matt
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Do you know what your local blend is? Around here (NJ) we blend with Ethanol in the summer. Gas mileage seems to drop a bit with Ethanol. Up until last year we used MTBE to blend, but that is banned now. MTBE seemed to increase mileage a bit in studies anyway.
Eric
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Eric G. wrote:

No, unfortunately, I don't know what the difference in blends are. I just know they use a formulation in the winter than allows easier starting in subzero weather. I think the blend has a higher RVP so that it is more volatile at low temps, but I don't know what the chemistry of the winter blend is or summer blend either.
Matt
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Not sure of the blend. Mine jumped after 5K bu it was still the same "season" (winter). We have now switched to a Summer blend but I am still getting the same mileage
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that's about what I am getting, Just got to Cgicago with 5000 miles on odo. averaged 31.6 MPH for first 90 miles to Hannibal MO driving 65MPH. From Hannibal to Chicago averaged 26 MPH driving 75 MPH with strong north wind (HeadWind..) NOw have 5000 miles on it and brake rotor still scoring and sweaking.... even with my foot off the brakes. Hyundayu tech: Hope my dealer will fix this when i get back to Calif...
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