My calculated mpg tends to run a bit lower than the dash.
I use the caluclated because I feel it is better to understate my mpg that to overstate it.
I figure if I am understating my mpg it takes a bit of ammunition away from someone who might otherwise say that my mpg is not "real".
If you look at my entries I enter in the calulated, but always identify the dash mpg in the "Other notes" area.
Example
Although I entered 74.9 in the database for my tank shared on November 23rd, I also wrote this in the Other Notes section:
11/20/04 fill up. 9.677 gallons. $1.969 per gallon. Dash: 75.2
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