mpwilliams wrote:

>> And yet, my '93 Accord consistently got 10-20% above EPA estimates on the
>> highway. Go figure.
>
> This may seem like an asinine question, but what is your process for
> calculating actual fuel mileage? Also, what is the elevation and range of
> mean daytime temperatures where you live? I ask the latter because lower
> elevations and lower mean ambient temperatures, in comparison to the
> location of the automaker's test facility, will result in comparative
> mileage improvements, ceteris paribus, due to more dense fuel/air mixtures
> prior to combustion.

I calculate my mileage the old-fashioned way. Start with a full tank (not
overfilled), drive the trip, fill up again, take note of how much gas I put
in at the end of the trip and how far I travelled, and do the calculations.

I live in southern Ontario (Canada), where spring and fall temperatures
range anywhere from 5-15 Celsius (41-59 Fahrenheit) and summer temperatures
range from 20-30 Celsius (68-86 Fahrenheit). The elevation is somewhat flat
with moderate hills in places.

EPA rated the '93 Accord automatic at 28mpg on the highway. My car
consistently averaged 32-34mpg on the highway under normal conditions. In
fact, it even got 36mpg on one occasion a few years ago. And BTW, those are
U.S. gallons in my mileage figures, not Imperial gallons.