You make a very valid point, Steve. While I do not obsess over specific fuel consumption, I do record every drop of fuel that I put in my V70 against the mileage covered. (I imagine that 'fuelly.com' works on a similar principle.)
Since purchase, over almost 11k miles, the car has averaged 29.5 MPG calculated thus. The OBC, which indicates a running average of 30.3. therefore over reads by 0.8 MPG or 2.7%.
Like you, I do not fully understand how the car computes this figure, but assume that there must be a flow-meter in the system which compares the amount of fuel used with the distance travelled.
Out of interest, my car is of a similar specification to your '98 10V Auto, and has covered just under 130k miles.
Regards, John.
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