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RX350
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#21
 
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Re: Nonlinearity - Gas Gauge or Range Gauge? (Was: RX350) -
11-14-2006
, 04:29 PM
| Ray O wrote: The error factor in the "distance remaining" display varies greatly depending on how the vehicle is being driven. There are so many factors that affect the actual distance that the vehicle will travel on a given amount of fuel that IMO, the "distance remaining" figure is pretty useless information. About the only time that the distance remaining figure is meaningful is when the vehicle is cruising at a steady speed with no gear changes. I expect it to use the average fuel economy figure in the calculation. It consitantly tells me I will be empty 40 odd kms too soon. Just if it was within 10 at least but 40+ is too much. But yes, I am stuck with it. |
fuel economy to calculate distance to empty. Knowing how Toyota engineers
think, their logic would be that how the vehicle is being driven now is a
more valid indication of what the remaining distance is than how the vehicle
was driven before because it ispossible that a change in drivers or driving
style will have a bigger effect on remaining distance than past driving
style
Quote:
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You probably have about 2 gallons remaining when the low fuel warning light starts to come on. I didn't know I had one! In my Audi it came on with 12 litres remaining (within 1/2 litre) as was stated in the book. I would fill it up right away, (lots of close stations) and it really was 12 l remaining. John |
come on with the other trouble lights when you turn the ignition on without
starting the car. I am pretty sure this is pointed out in the owner's
manual.
--
Ray O
(correct punctuation to reply)
#22
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"The Visitor" <ksjhdsdfssjhfk (AT) shduiysdfsrewh (DOT) com> wrote in message news:hdr6h.1048$J32.672 (AT) read1 (DOT) cgocable.net... Ray O wrote: The error factor in the "distance remaining" display varies greatly depending on how the vehicle is being driven. There are so many factors that affect the actual distance that the vehicle will travel on a given amount of fuel that IMO, the "distance remaining" figure is pretty useless information. About the only time that the distance remaining figure is meaningful is when the vehicle is cruising at a steady speed with no gear changes. I expect it to use the average fuel economy figure in the calculation. It consitantly tells me I will be empty 40 odd kms too soon. Just if it was within 10 at least but 40+ is too much. But yes, I am stuck with it. I am pretty sure that it is using instantaneous fuel economy and not average fuel economy to calculate distance to empty. Knowing how Toyota engineers think, their logic would be that how the vehicle is being driven now is a more valid indication of what the remaining distance is than how the vehicle was driven before because it ispossible that a change in drivers or driving style will have a bigger effect on remaining distance than past driving style |
minutes. Averaging over the entire trip/tank is meaningless if conditions
are changing. Audi's system seems to be a bit more accurate than
Toyota/Lexus, but if your driving conditions change, waiting 5 minutes
should give an adequately accurate estimate of "distance remaining" in all
cases.
Quote:
| You probably have about 2 gallons remaining when the low fuel warning light starts to come on. I didn't know I had one! In my Audi it came on with 12 litres remaining (within 1/2 litre) as was stated in the book. I would fill it up right away, (lots of close stations) and it really was 12 l remaining. John The low fuel warning light only comes on when the fuel is low and does not come on with the other trouble lights when you turn the ignition on without starting the car. I am pretty sure this is pointed out in the owner's manual. |
#23
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Not the instantaneous value... |
the gas). The remaining miles is a very steady number.
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...but a short-term average over the past few minutes. |
if you reset the system to zero, it uses the average MPG since reset.
#24
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I expect it to use the average fuel economy figure in the calculation. It consitantly tells me I will be empty 40 odd kms too soon. Just if it was within 10 at least but 40+ is too much. But yes, I am stuck with it. |
say 320 miles, so I guess I'm driving more aggresively lately or driving
less highway miles). When the fuel gauge says 1/4 tank, I think it says
about 60 miles (75 to 80 miles would be 1/4 of 300 or 320). When the
low fuel light comes on I think it says 20 miles.
Looks like they're subtracting about 20 miles (as opposed to 20
kilometers). Maybe they just subtract 20 "whatevers" depending what
mode it's set on.
#25
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#26
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Ignore anything except the gas gauge. You can do it! |
ignore it!
You can do it!
#27
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