My guess - it didn't.
But it did know that you were getting slightly higher (than your previous
average) mpg during the highway cruising. It re-calculated your new DTE
based on the full tank & recent mpg.
Eric Russell
Mebane, NC
http://home.mebtel.net/~ejrussell
----- Original Message -----
> I have always used 87 octane fuel. I was on a long trip recently and I
> stopped at a gas station that had a good price.
> how did it sense that I put in a different octane fuel and
> make an adjustment to the "DTE"?
>
> So, when I got back on the expressway. I reset my MPG display. (I
> typically
> get about 21.9 MPG at expressway speeds, 75-79) I drove nearly 400 miles
> before refueling. My MPG was 23.5. At this stop I decided to push the
> envelope further. I purchased the premium, 93 octane. This time when I
> turned on the engine the DTE showed 468! Again, how is it able to
> immediately sense what fuel I put in? After this, I drove for 331 miles
> and
> averaged 25.8 MPG.
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