I buy Randall's idea that it has a way to test the fuel octane as soon as
you start the engine because it was giving me an increased DTE reading
before I ever put it in gear....
-----Original Message-----
From: shop-talk-bounces@autox.team.net
[mailto:shop-talk-bounces@autox.team.net] On Behalf Of Jack Brooks
Sent: Sunday, April 11, 2010 5:53 PM
To: 'shop-talk'
Subject: Re: [Shop-talk] How do they do that?
>OTOH, the car is guessing that you filled up the tank. It can't measure
>the input to the tank, only the outflow. So it is possible that it is
>underestimating the amount of fuel you put in.
No, it can't measure inflow directly, but it can measure fuel level, so it
knows how much was added.
Jack
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