Date: Sat, 01 May 2004 09:27:46 +0100 From: Colin Stamp <colinnospamp.plus.com> Subject: Re: Fuel consumption figures computer wrong
On Sat, 1 May 2004 07:56:41 +0100, David Taylor <djtaylornospamoot.com> wrote: >> What's wrong with resetting the computer when you fill up and >> comparing the reading with the pump reading at the next fill-up? >> If the OP was doing that, then the discrepancy of over 10% is very >> dissapointing. > >Nothing wrong with doing that except that a) you don't know the accuracy >of the pump and b) can't guarantee that the fuel cut off works exactly >the same the next time so discrepancies in the filling aren't being >taken into account. > >I just can't get hung up on that amount of difference. :) Pumps should be reasonably reliable - I'm pretty sure they are legally regulated. It won't be perfect, but you'd have to be going some to get it wrong by over 6 litres in a tankful. Adding up all the uncertainties I'd expect well under 5%. For as much as 10%, I'd be starting to worry that something was wrong - maybe the fuel rail pressure is a bit high or something. Colin.