On 7/20/2017 3:56 PM, trader_4 wrote:

The readout on the computer still says 25 even though you only get 23.
Sort of like saying if you had pure gas this is what you;d have gotten
but you got something else.

Not if it's doing MPG the rational way, which, like DPB said is
simply distance travelled and gallons injected. It's not
calculating BTUs injected, at least not from the description
given, nor is there any reason to factor in energy content,
since the car doesn't know what it is.


Seems GM is not rational. In any case, it is always optimistic in my
experience.