re: Trip Computer --->o

[Phil Rose <pjrose@servtech.com>]

>Date: Thu, 07 May 1998 09:43 -0400 (EDT)
>From: Mark Pollan <Mark.POLLAN@mci.com>
>Subject: Trip Computer    --->o
>
>Hi All:
>
>My miles to empty is _way_ off.  MPG is a tad (10%) high, but nowhere
>near what I saw yesterday for miles to empty.  Fuel guage at half-way
>mark and I had 700+ miles still left in her.   Somebody must have put
>an 80 gallon tank in while I wasn't looking.
>
>Weird thing is when the tank is full the miles to empty is close (500+).
>When getting close to empty it seems failrly close too.  In between
>though...
>
>Thought on cause(s)?
>
>TIA as always,
>
>Mark Pollan '86 5KCSTQ 253K Miles

Mark,

The "miles to empty" is not calculated on the overall MPG average, but on
the most _recent_ values it sees (mile or so worth?). So if you have a
period easy going, or of coasting, etc, your "recent" mpg can go way up and
so will the MTE. However 700 MTE requires an average of 70 MPG at a
half-full tank. Wow! Were you doing a practice return from Pike's Peak? :)

Also, perhaps the slosh factor is greatest at half-full, tricking the
computer into thinking there's more gas than actual. But still, 700 miles
to empty is hard to rationalize.

Phil Rose		Rochester, NY
'89 100
'91 200q		pjrose@servtech.com