Just recently returned from vacation, and the rental car I had was an
'06 Sonata V6 with 1179 miles on it. I picked the car up in Denver a
bit disappointed since I was hoping for a Mustang. I drove the car
from Denver to Rapid City to Sioux Falls to Minneapolis and put about
1100 miles on the car. I was surprised by the size of the car (I have
an Elantra '05 hatch) it seemed much bigger then I thought it was. I
drove 98% of the time on the highway with the cruise control set
between 70-80 mph and the AC on, by the time I turned the car in the
trip computer said I was getting 40MPG. My only complaint about the
car was the control for the sunroof, I prefer separate switches for
tilt and open as opposed to the one switch in the Sonata (I kept
getting the feeling it wasn't closed properly). If I had known the
Sonata was this roomy and got such good gas mileage I would have bought
one instead of the Elantra.
The trip computer is obviously wrong.
The best you can expect at those speeds is ~25mpg.
It's unusual for the trip tech to be that far off. Mine usually agrees with
actual miles/gallons within less than 1mpg. Most other Sonata owners are
reporting it's very accurate on the highway.
The trip computer has 2 data points that begin with Avg MP.... are you sure
you weren't looking at the Average MP(H)our reading instead of the
MP(G)allon page? I took mine on a trip to Atlanta this week and according to
the computer, I averaged 26.5 MPG and 35MPH for the trip with probably 70%
freeway and 30% city/county roads. I could easily see your average being
40MPH or better with a higher percentage/duration of freeway time.
Just a thought anyway.
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