At speeds in the 100-110 KPH range on the highway, you should be able to
get over 35 mpg, if your car has a manual transmission.

Yep looks like the online calc i was using sucked..

Over 3384km of driving during the past month i'm getting 28.5 us mpg and
8.32 l/100km not as low as it could be but driving at 100-120km/h doesn't
help i'm sure.

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My math skills ain't what they used to be, but I don't think 39 MPG
equates to 8.6 l/100km.

I've started to keep track of my milage simply calculating it based on the
amount of gas and distance travelled since the last fill up.

I'm driving a 2002 2.0l Elantra.

I do mostly highway driving around 100-120km/h which is about 60-70mph and
get 39MPG or 8.6 l/100km for those north of the boarder like me ;-)

Those figures are based on 6 fillups mostly from about 1/4 - 1/2 empty
having travelled 2218km.

The only thing i've really gained from this is that i drive a heck of a
lot more than i thought. However, i am getting about what i expected from
the data i've seen on my vehicle.

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Well, the Scangauge I bought is working great, and I thought I'd share the
new tank of gas mileage with the group.

In -pure- city driving, and we're talking not any free speed length of more
than a quarter mile, ninety percent on stop and go with lights and
stopsigns every two or three blocks.  But decent slow driving.

At this point with close to half a tank used, 22.5 mpg.  And still very
slowly dropping.

Frowny face.

Normally it's a mixture of freeway and town, which puts it around 26 to 27,
but this stint of stop and go really takes it's toll.  The good part is
that I know it will get around 40 on the road, which makes it a little
better.

But still impressively low I think.