Date: Tue, 01 Feb 2005 09:08:32 +0000 From: Martin Rich <M.G.Richnospam.ac.uk> Subject: Re: How does the CPU figure out how much gas?
On Mon, 31 Jan 2005 17:14:31 +0000, Colin Stamp <colinnospamp.plus.com> wrote: >It uses the same sender as the fuel gauge to find out how full the >tank is. The MPG calculation only needs the ECU/speedo data and is >quite accurate, but the DTE calculation needs the fuel sender info as >well. Because of that, it isn't nearly so accurate - mine often reads >more when I start up after parking on a hill than when I parked. Very >handy as a rough guide though. > I'd noticed this effect - sometimes quite dramatically when the tank is close to empty, since in practice I use the DTE indication to see how low I really am once the 'low fuel' light comes on. I've also noticed the DTE increasing while on the move, particularly if you accelerate away from a stop and then cruise for a while. Martin