Anyone get BETTER mileage than the trip computer estimate?

[OliverGT]

bryan1980,

Don't panic, you don't have an issue and you are not doing anything wrong.

The car guage works the same as a Scanguage, it takes various readings from the ecu and tries to calculate MPG. The car manufacturers define the algorithm to get the closest number to actual MPG, the key word being closest.

If you get a Scanguage, there are various settings that you can adjust to get the Scanguage to read as close as possible to your manual calculations.

The most accurate way to measure MPG is to use the distance travelled and the fuel used. The cars guage, like a Scanguage is only ever going to be a best effort, albeit very close to the real value.

The value to be gained from either the cars guage or a Scanguage is not the absolute accuracy of average MPG over a tank of fuel, it is the instantaneous readouts and the ability to see how changing your driving changes the values, hopefully for the better.

Don't expect the car calculations to match your own calculations, they will always be different.

Compare like with like, so for example if you set your trip MPG each day and today you got X mpg going to work and then tomorrow you get X-1 going to work, then you know you have improved.

Similarly for you own tank calculations, if on the last tank you calculated Y mpg and now on this tank you got y-1 then again you have improved.

Oliver.