Have you checked the fuel mileage stated on the trip computer versus
I expected some optimism, but it varies considerably. Tonight's check for
271 miles of mostly highway showed a difference of 0.9 mpg. Computer stated
29.2 but calculated was 28.3 mpg Last week the difference was 3 mpg. others
were in the 2 mpg range of differential.
I'm not sure what should be expected on that type of metering, nor do I know
how the fuel consumption is measured. Is there a flow meter of sorts?
I've read that the trip meter mpg is based on injector
time open. It knows how much fuel can be squirted out
assuming rail pressure is normal.
I reset the trip meters often so have not been able
to average a trip using it. Between fill ups on the
rental vehicles it seems quite accurate.
The readout on my Sonata is better than previous models. Two trips, miles to
empty, mpg since last fill, instant mpg while driving, hours, average speed.
Large crisp numbers too.
The 4 cylinder turbo has about 25 more HP than my previous V-6 but gets
about 3 mpg better mileage.
Also, keep in mind that you seldom fill the vehicle to the exact same
"full" level each time, if the car is parked a little off level, or the
pump kicks off more of less aggressively, etc., you can easily vary half
a gallon or more from one fill-up to the next.
Now, if you keep a long-term running MPG as I do, that comes out in the
wash as the shortage on one tank becomes the overage on the next and
gets factored in. However, if you only check your mileage on one tank
and do so every so often, then substantial error can creep in.
True. I did a bunch of them sequentially and only one was off considerably,
but that did not correct in the next fill up as you might expect. Every one
was lower than the readout, as I would expect.
It is more difficult to be accurate to four decimal places like you could on
older cars. No more filling to the top of the filler pipe. After the shut
off I only round off to the nearest nickel. At today's prices, that pump
handle is a hair trigger on the $$$ dial.
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