Jon;
Mileage computers are best viewed with suspicion. Our Chrysler 300M computes
its mileage based on total fuel usage during the miles driven since the
computer was reset. This is what one would expect.
My reasonably new Dodge 2500 diesel mileage computer is apparently
programmed to compute a "rolling average" rather than the way the Chrysler
does it. Who knows what algorithm Dodge used to get that rolling average--
Kalman filtering, maybe? This rolling average makes this computer of dubious
worth. You only know what the average mileage was over some unknown time
period-- BFD.
I wonder why two Chrysler products can't compute fuel mileage the same way?
Regards, Neil Tucson, AZ
-----Original Message-----
From: land-speed-bounces+neil=dbelltech.com@autox.team.net
[mailto:land-speed-bounces+neil=dbelltech.com@autox.team.net] On Behalf Of
Jon Wennerberg
Sent: Monday, July 21, 2008 12:12 PM
To: DR MAYF; land-speed submit
Subject: Re: [Land-speed] Tires,Mileage,etc/non LSR ?
On Jul 21, 2008, at 3:01 PM, drmayf wrote:
Tom, Ed, all..
mayf
Speaking to something that Ed mentioned a few posts ago -- the fuel
computer display built into the dashboard. On my '04 GMC pickup
there's one of the computers, and I've checked the accuracy -- only
to find it's a bit generous (when compared to my figuring of fuel
economy). A couple of mpg too generous, in fact. The 'puter might
show 25.4 mpg on a road trip -- and when I figure the number of
gallons burned and the number of miles driven (using the readouts
from the fuel stations and the corrected mileage shown on the
odometer ) I'll get something like 23.9 mpg. These numbers are close
to the real world for me -- I do get mid-20's in my big pickup -- but
the computer shows even better.
I drive at or below posted speed limits 99% of the time, use the
cruise control as much as is possible, and don't do jackrabbit starts
-- all of which contribute to good mileage. Again -- YMMV.
Jon Wennerberg
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