On 05/14/2016 08:32 PM, Ed Pawlowski wrote:
The last five cars (different brands) had the computer that gave you the
mpg of a trip and since the last fill up. I've checked the old method
of filling the tank and calculating. The car computer ranged from 2 to
6 mpg too high

I go by a ScanGauge plugged into the ODB. When I fill up it is usually
within a tenth of a gallon on how much will take to fill the tank and
the tank mpg numbers jibe with the odometer.