Reply With QuoteThe gauge really just reads a level but the tank itself isn't always regular
in shape so the lever change to volume change may no be linear depending on
the shape of the fuel tank. Sounds like the ES tank has a tapered shape to
it.
--
-WJB
"David Z" <net> wrote in message
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Lexus: 2004 ES330 - Nonlinearity Of Gas Gauge
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- 08-20 01:16 AM #1DavidGuest
2004 ES330 - Nonlinearity Of Gas Gauge
When my gas tank is full, my 2004 ES330's computer says that the range
is 320 miles. When the range says 80 miles (=25% of 320), the gas gauge
says exactly 3/8th of a tank. According to the range reading, the gas
gauge should say 1/4th tank. Anyone know why the gas gauge overstates
the amount of gas by 50% (1/8th of a tank)?
Alternatively, if the gas gauge is correct, then the range should say
120 miles instead of 80 miles (a 33% understatement).
- 08-20 04:03 AM #2JeffGuest
Re: 2004 ES330 - Nonlinearity Of Gas Gauge
- 08-20 12:39 PM #3JeremiahGuest
Re: 2004 ES330 - Nonlinearity Of Gas Gauge
David Z wrote:
Probably to allow for people who run their tanks all the way down. Then you
have a 40 mile chance to still get gas before you're stranded for good! LOL
- 08-21 04:38 AM #4markjenGuest
Re: 2004 ES330 - Nonlinearity Of Gas Gauge
This degree of non-linearity is pretty common. It sound bads at a 50%
error, but absolute errors get amplified when you get to the bottom of the
tank - when you have a teaspoon of gas left that will take you 50 feet and
the computer says 1 mile, that's a 10,000% error.
- Mark
- 08-23 02:47 PM #5JCSGuest
Re: 2004 ES330 - Nonlinearity Of Gas Gauge
IMHO, it is the calculations in the trip computer that vary more than the
fuel gauge.
I frequently do 250 mile commutes in my 2003 ES 300. When the computer
shows my average mpg at 27 and I top off the tank, the range should show 450
miles or more... yet it never shows more than 308 or 310. After I have
traveled 100 miles on the tank, the range shows 250 miles remaining.
So somewhere the range calculation gets very ambiguous.
Dealer has no answer or insight.
"David Z" <net> wrote in message
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